Is there a way to get air quality via an api in the US that doesn't require api keys? weather.gov is one example of what I'm sorta looking for. I have a shell s

Is there a way to get air quality via an api in the US that doesn't require api keys? weather.gov is one example of what I'm sorta looking for. I have a shell script [1] that gets weather and solar radiation from free and open APIs. Adding in some sort of air quality index would be great. [1] https://github.com/mikecarper/bondhome/blob/main/weather.sh https://github.com/mikecarper/bondhome/blob/main/weather.sh