Density Map of Particulate Matter 1997
Source: Environmental Protection Agency
Map Description:
This map depicts particulate matter emissions by county in 1997. Particulate Matter (PM) is the general term used for a mixture of solid particles and liquid droplets found in the air. These particles, which come in a wide range of sizes, originate from many different stationary and mobile sources. Their chemical and physical compositions vary depending on location, time of year, and meteorology.
Scientific studies show a link between inhaled PM (alone, or cobined with other pollutants in the air) and a series of significant health effects. In addition, PM causes adverse impacts to the environment. PM is the major cause of reduced visibility in parts of the United States. Other environmental impacts occur when particles are deposited onto soils, plants, and water bodies.

Cautions for this Product:
This map provides a general overview and does not identify potential sources of air pollution.

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