kelnos / aqi-rs

Rust crate for calculating the Air Quality Index from particulate matter concentrations

aqi

The aqi crate provides functions for calculating the Air Quality Index based on concentrations of particuate matter.

The AQI is defined for ozone (O₃), 1.0-2.5 micron particulate matter (PM2.5), 2.5-10 micron particulate matter (PM10), carbon monoxide (CO), sulfur dioxide (SO₂), and nitrogen dioxide (NO₂).

The AQI helps make air quality more understandable to laypersons, normalizing air quality on a scale from 0 to 500, with round-number ranges that indicate qualities such as "Good", "Unhealthy", and "Hazardous".

For further information, see AQI basics and AQI techinical assistance.

Additionally, this library supports "adjusted" PM2.5 AQI values, using the LRAPA, EPA and AQandU conversion formulas.

aqi-rs's Issues

Add support for EPA AQI adjustment for PM2.5

The EPA completed a study in 2020 that corrects PurpleAir-derived sensor values, bringing them closer to AirNow official measurements.

From this study, it appears that the EPA adjustment outperforms several existing adjustments, including LRAPA.

It does require humidity as an input, but this is available from PurpleAir sensors, so shouldn't be an issue for users of the library.

PR coming that would add this adjustment, in the style of the existing ones. No API fanciness, just an extra argument for humidity.

Thanks for the work you've done on this so far!