|Exposures||The percentile rank of the tract’s average of the following five exposures indicators. Note that these are sourced from the EPA’s EJScreen, which provides nationally representative data.|
|Ozone||Ozone is a chemical that combines with other air pollutants to form smog and is a widespread and significant health threat.|
Method: Ozone summer seasonal avg. of daily maximum 8-hour concentration in air in parts per billion
|Particulate Matter 2.5 (PM 2.5)||Particulate Matter 2.5 (PM 2.5) is a mix of particles smaller than 2.5 micrometers in the air produced by cars, trucks, and industries. PM 2.5 is harmful to humans because it can move deep into our lungs and cause irritation, heart and lung disease, or cancer.|
Method: PM 2.5 levels in air, μg/m3, annual avg.
|Diesel Particulate Matter (Diesel PM)||Diesel particulate matter (Diesel PM) is small particles made by burning diesel. Diesel PM is known to cause eye and throat irritation, along with heart and lung disease and lung cancer. |
Method: Diesel particulate matter level in air, μg/m3
|Traffic||Traffic is a significant source of air pollution, particularly in urban areas, and has a wide range of negative effects including noise, vibration, injuries, illnesses and diseases due to air pollution. |
Method: Count of vehicles (average annual daily traffic) at major roads within 500 meters, divided by distance in meters (not km)
|Air Toxics||Air toxics are hazardous air pollutants from many sources including cars, trucks, and industrial facilities, and may cause cancer or other serious health effects. These include reproductive problems and birth defects.|
Method: Air toxics respiratory hazard index (ratio of exposure concentration to health-based reference concentration) from EPA’s National Air Toxics Assessment. 2014 data is, unfortunately, the most recent available on EJScreen.