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EPA AirWatch
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Incident Sites
Station PM2.5 CO O3 AQI Summary
1-hr avg 1-hr avg 1-hr avg
Units µg/m3 ppm ppb
Standard Sites
Station PM2.5 PM2.5 CO CO NO2 O3 PM10 SO2 Visibility AQI Summary Health category
24-hr avg 1-hr avg 8-hr avg 1-hr avg 1-hr avg 1-hr avg 1-hr avg 1-hr avg 1-hr avg based on PM2.5 24-hr avg
Units µg/m3 µg/m3 ppm ppm ppb ppb µg/m3 ppb µg/m3
Sensor Sites
Sensor sites allow us to get an indication of air quality in more areas but do not provide correct information when humidity is high (eg. during fog). Sensor site information is not displayed on EPA AirWatch when humidity at the site is above 80%. If sensors are not available or showing Poor or Very Poor air quality, please double check the result with a nearby standard site or self-assess air quality. Air quality images available here.
Sites Particles (e.g., smoke, fog) PM2.5 CO NO2 PM10 O3 SO2
1-hr avg 1-hr avg 8-hr avg 1-hr avg 1-hr avg 1-hr avg 1-hr avg
Units µg/m3 µg/m3 ppm ppb µg/m3 ppb ppb