India has 17 of the world's 20 most polluted cities. The existing AQI APIs either don't cover Indian cities well, or charge $99+/month. Antrolope is a free AQI API that works globally but is specifically built to have strong India coverage.
Source: [Dev.to](https://dev.to/kushal_d_3c84af8e8f3427e1/i-built-a-free-aqi-api-for-worldwide-cities-heres-how-53o0)