• PM2.5 Annual Average

    Environment / Small Particulate Air Pollution

    Small particles (“particulate matter”) less than 2.5 micrometers in diameter are referred to as PM2.5. These particles are so small that they can get deep into the lungs and cause breathing problems. PM2.5 is caused by all types of combustion, including motor vehicles, power plants, residential wood burning, forest fires, agricultural burning, and some industrial... More

  • Ozone 8-Hour Annual Average

    Environment / Ozone

    Ground-level ozone or smog irritates the lungs and can make it difficult for people to breathe. Ozone is formed when chemicals emitted by motor vehicles, power plants, certain industries and processes, and even vegetation react chemically in the presence of sunlight. Both ozone and some of the pollutants which cause it are carried by the... More