The U.S. EPA has a great resource for the Air Quality Index:

https://airnow.gov/index.cfm?action=aqibasics.aqi

that also describes the methodology used to calculate it. I hope it helps,

Jacek Koziel

Indian Air Quality Index. Hope it may help you.

We have a product in real time to that:

https://aqicn.org/map/brazil/

Thanks Gabriel. But what equation do you use exactly ?

This index is measured by CETESB (Organization for Environmental quality indexes, in São Paulo City), that have a publication about:

https://cetesb.sp.gov.br/ar/padroes-de-qualidade-do-ar/

Example: for MP10 considered good (index between 0-40) means MP10 concentration between 0-50 (µg/m3) in 24h.

In Mexico, City the metropolitan index of air qulity refers to: ozone (O3), particulates smaller than 10 micrometers(PM10), particulates smaller than 2.5 (PM2.5), Sulfur dioxide (SO2), nitrogen dioxide (NO2) and carbon monoxide (CO). The environmental regulation( NADF-009-AIRE-2006) also includes the IMECA calculation refers to the general level of pollution. I send you a table with the maths

for Türkiye - http://index.havaizleme.gov.tr/Map

Hi, in Ecuador is used the IQCA index.

Muchas gracias.

Please Refer : Akilan Raja, Research gate. A good discussion in this subject.