The sensor data displayed here is collected by PurpleAir Air Quality Sensors.

The numerical reports are based on the US EPA PM2.5 Air Quality Index (AQI). The AQI is a number used by goverment agencies to communicate how polluted the air currently is or how polluted it is forecast to become.

Particulate Matter (PM) 2.5 refers to the pollutants which are 2.5 micrometers or smaller.

Superfund sites are EPA-designated locations of pollution that require a long-term response to clean up hazardous material contaminations. Treatment, Storage, and Disposal Facilities (TSDF) are locations that produce some form of waste which needs to be disposed of according to strict regulations.

Data for Superfund sites can be found here and TSDF data can be found here.