emailNowcastPMAqi

US EPA Particulate Matter NowCast AQI (Air Quality Index) Algorithm The US EPA generally uses 24 hours periods of data to calculate AQI. To calculate AQI at an hourly scale the NowCast algorithm is a more appropriate choice Algorithm explained more fully at: https://observablehq.com/@openaq/epa-pm-nowcast inputs an array of measurements values of particulate matter returns an NowCast air quality index number between 0-500 0 to 50 Good 51 to 100 Moderate 101 to 150 Unhealthy for Sensitive Groups 151 to 200 Unhealthy 201 to 300 Very Unhealthy 301 to 500 Hazardous