HOEKSTRA, J.
In this action for declaratory relief, plaintiffs appeal as of right the trial court’s order denying their motion for summary disposition. We affirm.
I. BASIC FACTS AND PROCEDURAL HISTORY
Defendant Northwest Michigan Community Health Agency (NMCHA) is a multicounty district health department organized by Antrim, Charlevoix, Emmet, and Otsego counties under Part 24 of the Public Health Code (PHC), MCL 333.2401
et seq.
In purported furtherance of its duty to protect the public health and welfare in its district, the NMCHA promulgated what it entitled the Public Health Indoor Air Regulation of 2005 (the regulation). In addition to prohibiting smoking in all public places, the regulation requires employers who do not wholly prohibit smoking at an enclosed place of employment to designate an NMCHA-approved smoking room, which is required by the regulation to be “a separate enclosed area that is independently ventilated so that smoke does not enter other non-smoking areas of the worksite.” The regulation additionally prohibits an employer from discharging, refusing to hire, or otherwise retaliating against an employee for exercising his or her right to the smoke-free environment afforded by the regulation.
After the regulation was approved by each of the four counties, plaintiffs, each of whom resides or operates a business within defendant Charlevoix County, brought
this action to invalidate the regulation by judicial declaration that the NMCHA was without authority to promulgate such a regulation and that the regulation itself was preempted by Part 126 of the PHC, MCL 333.12601
et seq.,
which prohibits smoking in buildings used by the public except in designated areas. In seeking summary disposition on these grounds, plaintiffs argued that nothing in Part 126 of the PHC, which is also known as the Michigan Clean Indoor Air Act (MCIAA),
authorizes a local health department to enforce or augment the smoking restrictions set by the MCIAA. Plaintiffs further argued that § 12605 of the MCIAA, MCL 333.12605, grants owners and operators of public places the discretion to choose whether to maintain a smoking section or remain smoke-free, and that this discretion to permit smoking in public places constitutes a statutorily conferred right that a local health department cannot annul by regulation. Moreover, plaintiffs argued, where the owner or operator of a public place chooses to have a designated smoking area, § 12605 requires only that existing physical barriers and ventilation be used to minimize the toxic effects of smoking. Thus, insofar as the NMCHA regulation requires that smoking be restricted to a separate, enclosed area with independent ventilation, it conflicts with the MCIAA and must be found to be invalid.
Citing this Court’s decision in
Michigan Restaurant Ass’n v City of Marquette,
245 Mich App 63; 626 NW2d 418 (2001), plaintiffs further asserted that smoking is an issue better suited to regulation on a statewide basis, and that local regulation must therefore yield to the preemptive provisions of the MCIAA. Plaintiffs additionally argued that, to the extent the regulation impinges on the common-law right of an employer to
discharge an employee at will, the regulation violates public policy and is void. The trial court, however, disagreed and denied plaintiffs’ motion. This appeal followed.
II. ANALYSIS
Plaintiffs assert that the trial court erred in denying their motion for summary disposition. In doing so, plaintiffs again argue that the NMCHA lacked the authority to promulgate regulations restricting smoking and that local regulation was, in any event, preempted by the MCIAA. We disagree.
A. STANDARD OF REVIEW
Resolution of the questions presented on appeal requires the interpretation of statutes, which is a question of law that this Court reviews de novo. See
Michigan Coalition for Responsible Gun Owners v Ferndale,
256 Mich App 401, 405; 662 NW2d 864 (2003). When interpreting a statute, this Court’s goal is to ascertain and give effect to the intent of the Legislature by applying the plain language of the statute.
Gladych v New Family Homes, Inc,
468 Mich 594, 597; 664 NW2d 705 (2003).
B. OVERVIEW OF THE MICHIGAN CLEAN INDOOR AIR ACT
The MCIAA, enacted in 1986 as Part 126 of the PHC,
prohibits smoking “in a public place or at a meeting of a public body, except in a designated smoking area.” MCL 333.12603. Although seemingly broad in scope, “public place,” as defined by the MCIAA, renders the act inapplicable to most private-sector workplaces and public areas that are not themselves enclosed. See MCL
333.12601(m).
Also exempt from the requirements of the act are food service establishments,
MCL 333.12603(3), private educational facilities “after regularly scheduled school hours,” MCL 333.12603(4), and enclosed private rooms or offices occupied exclusively by a smoker, “even if the room or enclosed office may be visited by a nonsmoker,” MCL 333.12601(2). Further, the MCIAA expressly does not apply to “a room, hall, or building used for a private function if the seating arrangements are under the control of the sponsor of the function and not under the control of the state or local government agency or the person who owns or operates the room, hall, or building.” MCL 333.12603(2).
In all other public places in which smoking is not “prohibited by law,” the MCIAA permits a “person who owns or operates a public place” to designate a smoking area. MCL 333.12605(1).
In those public places in which
an owner or operator elects to designate a smoking area, the act requires that “existing physical barriers and ventilation systems shall be used to minimize the toxic effect of smoke in both smoking and adjacent nonsmoking areas.” MCL 333.12605(1).
The act further requires that seating within the public place be arranged “to provide, as nearly as practicable, a smoke-free area,” MCL 333.12607(b), and that the owner or operator develop, implement, and enforce “a written policy for the separation of smokers and nonsmokers which provides, at a minimum,” for a procedure to receive, investigate, and take action on complaints, and that ensures that nonsmokers will be located closest to the source of fresh air and that special consideration will be given to individuals with a hypersensitivity to tobacco smoke, MCL 333.12605(3); see also MCL 333.12607(c).
C. AUTHORITY OF THE NMCHA TO PROMULGATE SMOKING REGULATIONS
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HOEKSTRA, J.
In this action for declaratory relief, plaintiffs appeal as of right the trial court’s order denying their motion for summary disposition. We affirm.
I. BASIC FACTS AND PROCEDURAL HISTORY
Defendant Northwest Michigan Community Health Agency (NMCHA) is a multicounty district health department organized by Antrim, Charlevoix, Emmet, and Otsego counties under Part 24 of the Public Health Code (PHC), MCL 333.2401
et seq.
In purported furtherance of its duty to protect the public health and welfare in its district, the NMCHA promulgated what it entitled the Public Health Indoor Air Regulation of 2005 (the regulation). In addition to prohibiting smoking in all public places, the regulation requires employers who do not wholly prohibit smoking at an enclosed place of employment to designate an NMCHA-approved smoking room, which is required by the regulation to be “a separate enclosed area that is independently ventilated so that smoke does not enter other non-smoking areas of the worksite.” The regulation additionally prohibits an employer from discharging, refusing to hire, or otherwise retaliating against an employee for exercising his or her right to the smoke-free environment afforded by the regulation.
After the regulation was approved by each of the four counties, plaintiffs, each of whom resides or operates a business within defendant Charlevoix County, brought
this action to invalidate the regulation by judicial declaration that the NMCHA was without authority to promulgate such a regulation and that the regulation itself was preempted by Part 126 of the PHC, MCL 333.12601
et seq.,
which prohibits smoking in buildings used by the public except in designated areas. In seeking summary disposition on these grounds, plaintiffs argued that nothing in Part 126 of the PHC, which is also known as the Michigan Clean Indoor Air Act (MCIAA),
authorizes a local health department to enforce or augment the smoking restrictions set by the MCIAA. Plaintiffs further argued that § 12605 of the MCIAA, MCL 333.12605, grants owners and operators of public places the discretion to choose whether to maintain a smoking section or remain smoke-free, and that this discretion to permit smoking in public places constitutes a statutorily conferred right that a local health department cannot annul by regulation. Moreover, plaintiffs argued, where the owner or operator of a public place chooses to have a designated smoking area, § 12605 requires only that existing physical barriers and ventilation be used to minimize the toxic effects of smoking. Thus, insofar as the NMCHA regulation requires that smoking be restricted to a separate, enclosed area with independent ventilation, it conflicts with the MCIAA and must be found to be invalid.
Citing this Court’s decision in
Michigan Restaurant Ass’n v City of Marquette,
245 Mich App 63; 626 NW2d 418 (2001), plaintiffs further asserted that smoking is an issue better suited to regulation on a statewide basis, and that local regulation must therefore yield to the preemptive provisions of the MCIAA. Plaintiffs additionally argued that, to the extent the regulation impinges on the common-law right of an employer to
discharge an employee at will, the regulation violates public policy and is void. The trial court, however, disagreed and denied plaintiffs’ motion. This appeal followed.
II. ANALYSIS
Plaintiffs assert that the trial court erred in denying their motion for summary disposition. In doing so, plaintiffs again argue that the NMCHA lacked the authority to promulgate regulations restricting smoking and that local regulation was, in any event, preempted by the MCIAA. We disagree.
A. STANDARD OF REVIEW
Resolution of the questions presented on appeal requires the interpretation of statutes, which is a question of law that this Court reviews de novo. See
Michigan Coalition for Responsible Gun Owners v Ferndale,
256 Mich App 401, 405; 662 NW2d 864 (2003). When interpreting a statute, this Court’s goal is to ascertain and give effect to the intent of the Legislature by applying the plain language of the statute.
Gladych v New Family Homes, Inc,
468 Mich 594, 597; 664 NW2d 705 (2003).
B. OVERVIEW OF THE MICHIGAN CLEAN INDOOR AIR ACT
The MCIAA, enacted in 1986 as Part 126 of the PHC,
prohibits smoking “in a public place or at a meeting of a public body, except in a designated smoking area.” MCL 333.12603. Although seemingly broad in scope, “public place,” as defined by the MCIAA, renders the act inapplicable to most private-sector workplaces and public areas that are not themselves enclosed. See MCL
333.12601(m).
Also exempt from the requirements of the act are food service establishments,
MCL 333.12603(3), private educational facilities “after regularly scheduled school hours,” MCL 333.12603(4), and enclosed private rooms or offices occupied exclusively by a smoker, “even if the room or enclosed office may be visited by a nonsmoker,” MCL 333.12601(2). Further, the MCIAA expressly does not apply to “a room, hall, or building used for a private function if the seating arrangements are under the control of the sponsor of the function and not under the control of the state or local government agency or the person who owns or operates the room, hall, or building.” MCL 333.12603(2).
In all other public places in which smoking is not “prohibited by law,” the MCIAA permits a “person who owns or operates a public place” to designate a smoking area. MCL 333.12605(1).
In those public places in which
an owner or operator elects to designate a smoking area, the act requires that “existing physical barriers and ventilation systems shall be used to minimize the toxic effect of smoke in both smoking and adjacent nonsmoking areas.” MCL 333.12605(1).
The act further requires that seating within the public place be arranged “to provide, as nearly as practicable, a smoke-free area,” MCL 333.12607(b), and that the owner or operator develop, implement, and enforce “a written policy for the separation of smokers and nonsmokers which provides, at a minimum,” for a procedure to receive, investigate, and take action on complaints, and that ensures that nonsmokers will be located closest to the source of fresh air and that special consideration will be given to individuals with a hypersensitivity to tobacco smoke, MCL 333.12605(3); see also MCL 333.12607(c).
C. AUTHORITY OF THE NMCHA TO PROMULGATE SMOKING REGULATIONS
In challenging the validity of the regulation promulgated by the NMCHA, plaintiffs assert that nothing in Part 126 of the PHC authorizes a local health depart
ment to enforce or augment the smoking restrictions set by the MCIAA.
Plaintiffs argue that, pursuant to MCL 333.12613, implementation and enforcement of the act and rules promulgated thereunder is a power within the exclusive province of the Michigan Department of Community Health. Plaintiffs’ argument in this regard, however, is not sustained by the plain language of § 12613(2) of Part 126, which expressly provides that “the department may authorize a local health department to enforce this part and the rules promulgated under this part.” MCL 333.12613(2).
Moreover, even if the responsibility for the implementation and enforcement of the restrictions established by Part 126 had been exclusively granted to the Department of Community Health, that would not, by itself, deny a local health department the authority to promulgate, implement, and enforce similar regulations of its own making. As previously noted, Part 24 of the PHC authorizes the creation of local health departments such as the NMCHA. See MCL 333.2415 and 333.2421. Pursuant to § 2433 of Part 24, such departments are charged with the duty to
continually and diligently endeavor to prevent disease, prolong life, and promote the public health through organized programs, including prevention and control of envi
ronmental health hazards; prevention and control of diseases; prevention and control of health problems of particularly vulnerable population groups; development of health care facilities and health services delivery systems; and regulation of health care facilities and health services delivery systems to the extent provided by law. [MCL 333.2433(1).]
The regulation at issue is consistent with these duties and is authorized to be promulgated by the NMCHA under §§ 2435 and 2441 of Part 24, which provide that a local health department may “[a]dopt regulations to properly safeguard the public health,” MCL 333.2435(d), or regulations that “are necessary or appropriate to implement or carry out the duties or functions vested by law in the local health department,” MCL 333.2441(1). See also MCL 333.2433(2)(a) (which provides that a local health department “shall. . . [i]mplement and enforce laws for which responsibility is vested in the local health department”). As argued by defendants, the only limitation placed by the Legislature on the promulgation and adoption of such regulations is that they “be at least as stringent as the standard established by state law applicable to the same or similar subject matter.” MCL 333.2441(1).
The regulation at issue here, being more restrictive than the standards set by the MCIAA, meets this requirement.
We recognize plaintiffs’ argument that, under a plain reading of § 2433(1), the fulfillment of the duties im
posed by that section on local health departments is arguably limited to the institution of programs. The section must, however, be read in context and in light of the purpose of both Part 24 and the PHC in general. See
Macomb Co Prosecuting Attorney v Mur
phy, 464 Mich 149, 159; 627 NW2d 247 (2001). As noted earlier, MCL 333.2435(d) expressly grants a local health department authority to “[a]dopt regulations to properly safeguard the public health.” Plaintiffs assert that the Legislature has also granted local health departments more specific powers.
However, that does not lessen the general duty and authority of those agencies to protect the public health, MCL 333.2433(1), and to adopt and implement regulations for that purpose, MCL 333.2435(d) and 333.2441(1). In fact, the preliminary provisions of the PHC require that the code and each of its various parts “be liberally construed for the protection of the health, safety, and welfare of the people of this state.” MCL 333.1111(2); see also MCL 333.2401(2) (stating that the “general definitions and principles of construction” contained in article 1 of the PHC, MCL 333.1101
et seq.,
are “applicable to all articles in this code”), and
Frens Orchards, Inc v Dayton Twp Bd,
253 Mich App 129, 134-135; 654 NW2d 346 (2002) (applying the preliminary provisions of the PHC to Part 124 of the code, regulating agricultural labor camps). Because, when so construed, the provisions of Part 24 evince a legislative intent to permit regulation of the kind at issue here, we reject plaintiffs’ assertion that the NMCHA was without authority to promulgate the regulation.
D. PREEMPTION
Plaintiffs also argue that the regulation at issue is preempted by the MCIAA and that the regulation is therefore invalid regardless of whether the NMCHA was authorized to promulgate the regulation. Again, we disagree.
State law preempts regulation by an inferior level of government
in two situations: (1) where the local regulation directly conflicts with a state statute, or (2) where the statute completely occupies the field that the local regulation attempts to regulate. See
Rental Prop Owners Ass’n of Kent Co v Grand Rapids,
455 Mich 246, 257; 566 NW2d 514 (1997). Plaintiffs challenge the NMCHA smoking regulation on both grounds.
1. DIRECT CONFLICT
For purposes of preemption, a direct conflict exists between a local regulation and a state statute when the local regulation permits what the statute prohibits or prohibits what the statute permits.
People v Llewellyn,
401 Mich 314, 322 n 4; 257 NW2d 902 (1977). Here, in challenging the validity of the NMCHA regulation by claiming that it is in conflict with the MCIAA, plaintiffs assert that § 12605 of the act grants owners and operators of public places the discretion to choose whether to maintain a smoking section or remain smoke-free, and
thereby confers a statutory right impermissibly nullified by the regulation. See MCL 333.12605(1). Plaintiffs further argue that where the owner or operator of a public place chooses to exercise this right by designating a smoking area, § 12605 of the MCIAA requires only that existing physical barriers and ventilation be used to minimize the toxic effects of smoking. Thus, plaintiffs argue, by requiring that smoking be restricted to a separate enclosed area with independent ventilation, the regulation further conflicts with the MCIAA and must be found to be invalid. However, plaintiffs’ interpretation of § 12605 disregards its plain language.
With respect to designation of a smoking area, § 12605(1) of the MCIAA provides:
A smoking area may be designated by the state or local governmental agency or the person who owns or operates a public place, except in a public place in which smoking is prohibited by law. If a smoking area is designated, existing physical barriers and ventilation systems shall be used to minimize the toxic effect of smoke in both smoking and adjacent nonsmoking areas. [MCL 333.12605(1).]
As argued by defendants, a plain reading of the statute indicates that exercise of the discretion to designate a smoking area afforded by § 12605(1) is expressly excepted from those public places “in which smoking is prohibited by law.” This Court has previously recognized that “[t]he term ‘law’ may include those principles promulgated in constitutional provisions, common law, and
regulations
as well as statutes.”
Vagts v Perry Drug Stores, Inc,
204 Mich App 481, 485; 516 NW2d 102 (1994) (emphasis added). That the Legislature intended the regulations of a local health department to have such force and effect is supported by § 2441 of the PHC, which states that the “[rjegula-
tions of a local health department supersede inconsistent or conflicting local ordinances,” MCL 333.2441(1), and renders violation of a local health department regulation “a misdemeanor, punishable by imprisonment for not more than 90 days, or a fine of not more than $200.00, or both,” MCL 333.2441(2). Thus, contrary to plaintiffs assertion, the regulation does not prohibit what the MCIAA permits.
Llewelyn, supra
at 322 n 4. Accordingly, there is no conflict between the two regulatory schemes.
2. EXCLUSIVE OCCUPATION
As noted, however, regulation of smoking by the NMCHA is nonetheless precluded if the state statutory scheme preempts the regulation by occupying the field of regulation to the exclusion of local regulation.
Id.
In
Llewelyn, supra
at 323-325, our Supreme Court set forth the following four guidelines for determining whether a state statute so occupies a field of regulation that local regulation by inferior levels of government is preemptively precluded:
First, where the state law expressly provides that the state’s authority to regulate in a specified area of the law is to be exclusive, there is no doubt that municipal regulation is pre-empted.
Second, pre-emption of a field of regulation may be implied upon an examination of legislative history.
Third, the pervasiveness of the state regulatory scheme may support a finding of pre-emption. While the pervasiveness of the state regulatory scheme is not generally sufficient by itself to infer pre-emption, it is a factor which should be considered as evidence of pre-emption.
Fourth, the nature of the regulated subject matter may demand exclusive state regulation to achieve the uniformity necessary to serve the state’s purpose or interest.
As to this last point, examination of relevant Michigan cases indicates that where the nature of the regulated subject matter calls for regulation adapted to local conditions, and the local regulation does not interfere with the state regulatory scheme, supplementary local regulation has generally been upheld.
However, where the Court has found that the nature of the subject matter regulated called for a uniform state regulatory scheme, supplementary local regulation has been held pre-empted. [Citations omitted.]
With regard to application of these guidelines to the regulatory schemes at bar, plaintiffs correctly do not assert that the MCIAA expressly preempts local regulation of smoking. Indeed, there is nothing in the provisions of Part 126 to support such an assertion. To the contrary, by excepting those public places “in which smoking is prohibited by law” from the right of an owner or operator of a public place to designate a smoking area, the Legislature has left open the possibility of additional regulation by inferior levels of government, including local health departments. MCL 333.12605(1).
Plaintiffs also do not argue that preemption is implied by the legislative history of the MCIAA. However, we find guidance in the history of the MCIAA and its place within the PHC. The legislative declaration accompanying the enactment of the MCIAA contains no expression of a need for uniform statewide control of smoking. See the title of 1986 PA 198.
Furthermore, the inclusion of a specific, limited preemption provision in Part 129 of the PHC supports a conclusion that the later-enacted MCIAA has no implied general preemptive effect.
As recognized by this Court in
Marquette, supra
at 68-69, Part 129 of the PHC contains an express preemption provision giving preclusive effect to MCL 333.12905, governing smoking in food service establishments. See MCL 333.12915.
It is well settled that statutes that relate to the same subject or share a common purpose are
in pari materia
and must be read together as one law, even if they contain no reference to one another and were enacted on different dates.
State Treasurer v Schuster,
456 Mich 408, 417; 572 NW2d 628 (1998). Under this principle of statutory construction, and in the absence of any express preclusion, the inference to be drawn from the Legislature’s having given preclusive effect to Part 129 of the PHC is a concomitant intention not to give preclusive effect to Part 126. See, e.g.,
Farrington v Total Petroleum, Inc,
442 Mich 201, 210; 501 NW2d 76 (1993) (the omission of
a provision in one part of a statute that is included in another part should be construed as intentional).
Moreover, contrary to plaintiffs’ assertion, the scheme of smoking regulation established by Part 126 of the PHC is not so broad and detailed in scope as to require a determination that it has precluded all local regulation in that area. Although the MCIAA sets specific requirements for the designation of smoking areas, those requirements are not all-encompassing. To the contrary, the MCIAA expressly addresses many of its requirements as “mínimums,” see MCL 333.12605(3) and 333.12607, to be employed “to provide, as nearly as practicable, a smoke-free area,” MCL 333.12607(b). Further, as noted earlier, although seemingly broad in scope, the definition of “public place” provided by the MCIAA renders the act inapplicable to most private-sector workplaces and public areas that are not themselves enclosed. MCL 333.12601(m).
With regard to the final guideline set forth by the Court in
Llewelyn,
plaintiffs rely on this Court’s decision in
Marquette, supra,
for the proposition that the regulation of smoking is a statewide issue better left to uniform regulation by the Legislature. However, we agree with defendants that the majority’s statement that “[sjmoking is a statewide issue that is not local in character” is merely dictum and, therefore, does not constitute binding precedent under MCR 7.215(J)(1).
Marquette, supra
at 67; see also
Dessart v Burak,
252 Mich App 490, 496; 652 NW2d 669 (2002). Indeed, as argued by defendants, the majority’s conclusion that
the common-law doctrine of preemption applied for this reason to preempt the municipal ordinance at issue in that case was unnecessary given the Court’s acknowledgment of the expressly preclusive effect of MCL 333.12915.
Marquette, supra
at 68-69.
Nonetheless, we agree with the majority in
Marquette, supra
at 67, that smoking is inherently an issue of statewide concern that does not necessarily call for regulation adapted to local conditions. Again, however, there is nothing in the legislative declaration accompanying the enactment of the MCIAA to indicate legislative concern for statewide, uniform regulation of that subject matter. To the contrary, and as already discussed, the MCIAA, as enacted by the Legislature, allows for local regulation in this area. Under such circumstances, we conclude that the statewide nature of the subject matter of the NMCHA regulation does not support preemption.
E. EMPLOYMENT AT WILL
Finally, plaintiffs argue that because the regulation’s provision that an employer cannot discharge, refuse to hire, or otherwise retaliate against a person for exercising his or her right to a smoke-free environment adversely affects the common-law right of an employer to discharge an employee at will, the NMCHA regulation violates public policy and is therefore void. Again, we disagree.
Plaintiffs correctly argue that, in the absence of a contract providing to the contrary, employment is usually terminable by the employer or the employee at any time, for any or no reason whatsoever.
Suchodolski v Michigan Consolidated Gas Co,
412 Mich 692, 694-695; 316 NW2d 710 (1982). It is well settled, however, that an employer is not free to discharge an employee at wall
when the reason for the discharge contravenes public policy. See
id.
at 695.
In
Suchodolski, supra
at 695-696, our Supreme Court provided three examples of public-policy exceptions to an employer’s right to discharge an at-will employee under the employment at will doctrine. An at-will employee’s discharge violates public policy if any one of the following occurs: (1) the employee is discharged in violation of an explicit legislative statement prohibiting discharge of employees who act in accordance with a statutoiy right or duty; (2) the employee is discharged for the failure or refusal to violate the law in the course of employment; or (3) the employee is discharged for exercising a right conferred by a well-established legislative enactment.
Id.
Although not itself a legislative enactment or statement, the regulation at issue here provides employees with certain specified rights and was, as required by MCL 333.2441(1), approved for application by the governing bodies of each of the various counties served by the NMCHA.
Given these facts, and considering the public policy of minimizing the effects of smoking evinced by the Legislature through its enactment of Part 126 and § 12905 of Part 129 of the PHC, the regulation’s restriction of the general right to discharge an employee at will is consistent with the exceptions to that doctrine set forth in
Suchodolski.
Accordingly, we reject plaintiffs’ claim that the regulation’s prohibition in this regard itself violates public policy and is therefore void.
Affirmed.