Ambient Air Quality NEPM - Standards and Goals

In June 1998 the NEPC agreed to set uniform standards for ambient air quality (ambient air does not include indoor air). The standards contained in the NEPM for ambient air quality are listed below. The NEPM has been varied to add an advisory PM_2.5 standard. Click here for a copy and more information of the Ambient Air Quality NEPM as varied May 2003.

Standards and Goal

Pollutant

Averaging period

Maximum concentration

Goal within 10 years Maximum allowable exceedences

Carbon monoxide

8 hours

9.0 ppm

1 day a year

Nitrogen dioxide

1 hour
1 year

0.12 ppm
0.03 ppm

1 day a year
none

Photochemical oxidants (as ozone)

1 hour
4 hours

0.10 ppm
0.08 ppm

1 day a year
1 day a year

Sulfur dioxide

1 hour
1 day
1 year

0.20 ppm
0.08 ppm
0.02 ppm

1 day a year
1 day a year
none

Lead

1 year

0.50 µg/m3

none

Particles as PM10

1 day

50 µg/m3

5 days a year

JURISDICTIONAL IMPLEMENTATION

Click here for information on the implementation of the Ambient Air Quality NEPM reports.

JURISDICTIONAL MONITORING PLANS

Each jurisidiction has developed a monitoring plan to measure its performance against the standards. Click here to view jurisdictional monitoring plans.

JURISDICTIONAL MONITORING REPORTS

To view jurisdictional monitoring reports for the Ambient Air Qualtiy NEPM in 2006 click here.

To view jurisdictional monitoring reports for the Ambient Air Qualtiy NEPM in 2005 click here.

To view jurisdictional monitoring reports for the Ambient Air Qualtiy NEPM in 2004 click here.

To view jurisdictional monitoring reports for the Ambient Air Qualtiy NEPM in 2003 click here.

To view jurisdictional monitoring reports for the Ambient Air Qualtiy NEPM in 2002 click here.