Thus, choosing an alternate sort order for a report would change the sequence numbers associated with particular rows. No. of Exceedences of EPA Standard Number of times pollutant concentration exceeded an EPA air quality standard. Counts are shown separately for each of six years. If any count is non-zero, the report row is red . If a column is blank, no monitoring data were reported for the year.
Some pollutants have multiple air quality standards.
The following table lists the specific type of exceedences reported for each pollutant. Region EPA region number in which a site is located. There are ten EPA regions. The Regional Contacts page gives the locations of regional offices and a list of the states and U.S. territories they serve. State Postal abbreviation for the state or territory in which a site is located.