This is based on this document from the EPA: https://nepis.epa.gov/Exe/ZyPDF.cgi/P100W5UG.PDF?Dockey=P100W5UG.PDF
Note that additional work is needed to average the Particulate Matter (PM) values before conversion, this package only implements the calcuation, not data gathering or averaging.
The AQI conversion is essentially a table of ranges with the concentration linerly scaled to map the the AQI output value The concentration input may be averaged over some timespan, eg. NowCast
Which is described here: https://www.airnow.gov/faqs/how-nowcast-algorithm-used-report/
Call the Lookup function with PM2.5 or PM10 and a float64 PM
value. It will return the AQI value and the name of the range it falls
into.
package main
import (
"fmt"
"github.com/bcl/aqi"
)
func main() {
var pm2p5 float64
var pm10 float64
pm2p5 = 17.4
pm10 = 3
aqi_2p5, name_2p5, _ := aqi.Lookup("PM2.5", pm2p5)
aqi_10, name_10, _ := aqi.Lookup("PM10", pm10)
fmt.Printf("PM2.5 AQI = %d (%s)\n", aqi_2p5, name_2p5)
fmt.Printf("PM10 AQI = %d (%s)\n", aqi_10, name_10)
}