Primary Standards

Secondary Standards

Ohio Attainment Status

Pollutant

Level

Averaging Time

Level

Averaging Time

Carbon 
Monoxide

9 ppm 
(10 mg/m³)

8-hour 

None

Full Attainment

35 ppm 
(40 mg/m³)

1-hour 

Full Attainment

Lead

0.15 µg/m³ 

Rolling 3-Month Average

Same as Primary

Not yet Designated

1.5 µg/m³

Quarterly Average

Same as Primary

Full Attainment

Nitrogen 
Dioxide

0.053 ppm 
(100 µg/m³)

Annual 
(Arithmetic Mean)

Same as Primary

Full Attainment

Particulate 
Matter (PM₁₀)

150 µg/m³

24-hour 

Same as Primary

Full Attainment

Particulate 
Matter (PM_2.5)

15.0 µg/m³

Annual 
(Arithmetic Mean)

Same as Primary

35 µg/m³

24-hour 

Same as Primary

Ozone

0.075 ppm (2008 std)

8-hour 

Same as Primary

0.08 ppm (1997 std)

8-hour 

Same as Primary

Map

0.12 ppm

1-hour 

Same as Primary

Sulfur 
Dioxide

0.03 ppm

Annual 
(Arithmetic Mean)

0.5 ppm 
(1300 µg/m³)

3-hour 

Full Attainment