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Air Home > Air Quality Forecast > Historical Data > Live Data Look-up

Historical Air Quality Data

Use the form below to search and view historical air quality data.

Note: This data has not been through QA Analysis. The data available here are data collected directly from the moritoring stations across the state. It has not been reviewed for accuracy, nor have past values been modified to reflect current advancements in pollutant calculation algorithms. View data which has been through the QA process.

IMPORTANT NOTE: Due to circumstances beyond our control, the data presented on this and subsequent pages is not color coded to the newly revised Air Quality Index (AQI) for ozone and particle pollution. For ozone Moderate now begins at 60 parts per billion (ppb) and Unhealthy for Sensitive Groups (USG) begins at 76 ppb while for particle pollution Moderate still begins at 15.5 micrograms per cubic meter (ug/m3) and USG now begins at 35.5 ug/m3. Please go to the AQI conversion tables accessible from the Air Quality Index page to view the data ranges for each AQI category. We expect that these web pages will display the data correctly by summer.

 

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In April 2004, EPA published the new 8-hour standard for ground-level ozone set at a level of 80 parts per billion (ppb). Exceedances of this standard are 8-hour monitoring averages of 85 ppb or more. At that time areas were designated attainment or nonattainment for the 8-hour standard. Two areas in Maine were designated as nonattainment for the 8-hour standard. They are: the Portland Nonattainment Area which includes parts of York and Cumberland Counties and all of Sagadahoc County, and the Hancock Knox Lincoln Waldo County Nonattainment Area which includes portions of those counties.

Before the 8-hour standard was adopted, EPA's ambient air quality standard for ozone was 120 ppb averaged over a one-hour period. This 1-hour standard is no longer in effect.

EPA has revised standards for particle pollution. The particle pollution standard specifically addresses particles smaller than 2.5 microns (PM2.5). The PM2.5 standard is 15 micrograms per cubic meter based on an annual average and 35 micrograms per cubic meter on a 24-hour average.