Air Quality Monitoring Data Trends

Number of Eight-Hour Carbon Monoxide Exceedance Days in the Maricopa County Maintenance Area.
2nd Highest Eight-Hour Carbon Monoxide Concentrations in the Maricopa County Maintenance Area.
Violations of the Eight-Hour Ozone Standardsin the Maricopa Nonattainment Area
 
Highest 3-Year Average of the 4th Highest 8-Hour Ozone Concentration in the Maricopa Nonattainment Area
Number of 24-Hour PM-10 Exceedance Days in Maricopa County and the PM-10 Nonattainment Area

Air Quality Boundaries in the MAG Region

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Air Quality Boundaries in the MAG Region

U. S. Environmental Protection Agency – Our Nation’s Air

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Our Nation’s Air