Days Exceeding NAAQ Standards for Fine Particulate Matter

This layer displays the percentage of days (in a single year) with the concetration of fine particulate matter (fine particles 2.5 micrometers or less) above the National Ambient Air Quality Standard (NAAQS) of 35.0 micrograms per cubic meter.

Days Exceeding NAAQ Standards for Ozone

This layer displays the percentage of days (in a single year) with the maximum 8-hour average ozone concetration above the National Ambient Air Quality Standard (NAAQS) of 0.070 parts per million.

Air Toxics – Non-Cancer Risk by Census Tract

Layer displays the modeled non-cancer risk associated with air toxics exposure. A hazard index (HI) of 1 or lower means air toxics are unlikely to cause adverse noncancer health effects over a lifetime of exposure.