Air Quality Index - AQI alternatives

I have been writing a weather application and have found the functionality of ClimaCell's API to be much more useful than others out there.

They have the ability to set up alerts so that I can provide notifications to my users which is something that I did not see from other options. The also have an easy to use overlay so that I can show a precipitation map with very little work. Another company provided an overlay but they forced you to use their branding and look and feel on the overlay map. That was a big drawback for me as I like to be able to have my own look and feel for applications that I am writing. Their data is also more detailed than what I could find elsewhere and very accurate.

Support from them has been great as they were able to answer any of my questions that I had for them. Turnaround time was very good and I never felt like I was shooting off emails into a black hole.

Overall my experience with ClimaCell's API has been very positive and made my app creation go very smoothly.