The California Environmental Screening Tool is a mapping tool that identifies California communities by census tract that are disproportionately burdened by, and vulnerable to, multiple sources of pollution. In this tab, you have the option to turn on the CalEnviroScreen filter, and explore individual census tracts based on their scores.

100% 90% 80% 70% 60% 50% 40% 30% 20% 10%
Click on the map to show the score


PurpleAir monitors are low cost sensors providing real time measurement of air quality on a public map and a useful tool for community science data collection. PurpleAir monitors measure airborne particulate matter (PM). Particulate matter describes solid particles suspended in air; this includes dust, smoke, and other organic and inorganic particles including particle sizes and pollution concentrations of PM1.0, PM2.5, and PM10. Particulate Matter is related to burning of diesel engines, cars exhausts, industries burning engines, wood burning and wild fires.

PurpleAir Monitors use the Air Quality Index or AQI to measure the state of air quality. The (AQI) is a broadly used tool that assesses the current status of air pollution in an area. It is calculated by the U.S. Environmental Protection Agency. It focuses on health effects you may experience within a few hours or days after breathing polluted air. The AQI is divided into colors as follows:


Select Facility Type
All Facilities

These facilities-of-concern are industrial facilities that our Air Quality Ambassadors identified as a main concern given the over clustering of these facilities in the community and their potential adverse air quality and health impacts in the community (e.g., oil drilling sites, auto body shops, dry cleaners, metal manufacturing facilities, and gas stations). The facilities-of-concern also include any other industrial facilities identified by our academic research team that could present additional air pollution impacts to the community including (e.g., general, textile, and chemical manufacturing, warehousing and transportation, and construction).

In total, 280 facilities-of-concern were identified.