Air Quality Index Chart

Geographic Area: Philadelphia Co, Pennsylvania
Date Range: January - December 2007
Chart Type: Daily values (See Summary)

AQI Values: Maximum 187, Minimum 19, Percentiles... 90th 90, 75th 66, 50th 47, 25th 35
AQI Category: Days Good 200 (55%), Moderate 141 (39%), Unhealthy/Sensitive 21 (6%), Unhealthy 3 (0.8%)
Main Pollutant: Days CO 4 (1%), O3 166 (45%), SO2 1 (0.3%), PM2.5 192 (53%), PM10 2 (0.5%)

365 Days of AQI data selected
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Disclaimer: Information in this chart comes from a monthly extract of EPA's Air Quality System (AQS) database. Data for this chart were extracted on January 10, 2009. They represent the best information available to EPA from state agencies on that date. However, some values may be absent due to incomplete reporting, and some values subsequently may be changed due to quality assurance activities. The AQS database is updated daily by state and local organizations who own and submit the data. Please contact the pertinent state agency to report errors.

Readers are cautioned not to infer a qualitative ranking order of geographic areas based on AirData maps, charts, or reports. Air pollution levels measured in the vicinity of a particular monitoring site may not be representative of the prevailing air quality of a county or urban area. Pollutants emitted from a particular source may have little impact on the immediate geographic area, and the amount of pollutants emitted does not indicate whether the source is complying with applicable regulations.

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