Pollutant

Primary/ Secondary

Averaging Time

Level

Form

Nitrogen Dioxide (NO2)

Primary

1 hour

100 ppb

98th percentile of 1-hour daily maximum concentrations, averaged over 3 years

Primary and Secondary

1 year

53 ppb

Annual Mean

Ozone (O3)

Primary and Secondary

8 hours

0.070 ppm

Annual fourth-highest daily maximum 8-hour concentration, averaged over 3 years

Particle Matter

PM2.5

Primary

1 year

12.0 μg/m3

Annual mean, averaged over 3 years

Primary and Secondary

24 hours

35 μg/m3

98th percentile, averaged over 3 years

PM10

Primary and Secondary

24 hours

150 μg/m3

Not to be exceeded more than once per year on average over 3 years