Part 50 — National Primary and Secondary Ambient Air Quality Standards

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