Airnow AQI C code Implementation of AQI calculations from raw sensor concentrations in aqi.h. See air-quality.yaml for an ESPHome exmaple that uses an adafruit esp32s3 connected to a PMSA003I air quality sensor module. References https://www.airnow.gov/sites/default/files/2020-05/aqi-technical-assistance-document-sept2018.pdf https://www.adafruit.com/product/5477 https://www.adafruit.com/product/4632