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FEDERAL · 40 CFR

Part 50 — National Primary and Secondary Ambient Air Quality Standards

21 sections · Title 40: Protection of Environment

§ 50.1Definitions.
§ 50.2Scope.
§ 50.3Reference conditions.
§ 50.4National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
§ 50.5National secondary ambient air quality standard for sulfur oxides (sulfur dioxide).
§ 50.6National primary and secondary ambient air quality standards for PM<sub>10</sub>.
§ 50.7National primary and secondary ambient air quality standards for PM<sub>2.5</sub>.
§ 50.8National primary ambient air quality standards for carbon monoxide.
§ 50.9National 1-hour primary and secondary ambient air quality standards for ozone.
§ 50.10National 8-hour primary and secondary ambient air quality standards for ozone.
§ 50.11National primary and secondary ambient air quality standards for oxides of nitrogen (with nitrogen dioxide as the indicator).
§ 50.12National primary and secondary ambient air quality standards for lead.
§ 50.13National primary and secondary ambient air quality standards for PM<sub>2.5</sub>.
§ 50.14Treatment of air quality monitoring data influenced by exceptional events.
§ 50.15National primary and secondary ambient air quality standards for ozone.
§ 50.16National primary and secondary ambient air quality standards for lead.
§ 50.17National primary ambient air quality standards for sulfur oxides (sulfur dioxide).
§ 50.18National primary ambient air quality standards for PM<sub>2.5</sub>.
§ 50.19National primary and secondary ambient air quality standards for ozone.
§ 50.20National primary ambient air quality standards for PM<sub>2.5</sub>.
§ 50.21National secondary ambient air quality standards for sulfur oxides (sulfur dioxide).