[jxramos]

The shortcoming of the AirNow data is the sparse sampling. If you search for your city you can see the caveat underneath with something like "AnyTown Reporting Area". When you look at the sensor coverage it's much more sparse than the corresponding PurpleAir sensor coverage.

There's also the fire map that includes both public and private sensors, the regular interactive map I don't believe uses all the available sensors. https://fire.airnow.gov/ > Notice: The Sensor Data Pilot adds a new layer of air quality data from low-cost sensors.