Cleanest/Best Counties in the US Percentile Dirtiest/Worst Counties in the US 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Section 1: Emissions Carbon Monoxide emissions: Nitrogen Oxides emissions: PM-2.5 emissions: Nitrogen Oxides emissions, ozone season daily average: PM-10 emissions: Sulfur Dioxide emissions: Volatile Organic Compound emissions: Volatile Organic Compound emissions, ozone season daily average: 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Section 2: Exposures Air Quality Index: Carbon Monoxide 1-hour average concentration: Carbon Monoxide 8-hour average concentration: Lead quarterly average concentration: Nitrogen Dioxide annual average concentration: Ozone 1-hour average concentration: Ozone 8-hour average concentration: PM-2.5 24-hour average concentration: PM-2.5 annual average concentration: PM-10 24-hour average concentration: PM-10 annual average concentration: Sulfur Dioxide 3-hour average concentration: Sulfur Dioxide 24-hour average concentration: Sulfur Dioxide annual average concentration: 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Section 3: Health Risks Person-days in exceedance of national air quality standard for ozone (1-hour): Person-days in exceedance of national air quality standard for ozone (8-hour): These rankings are relative to the entire U.S. See rankings within just this state.

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