What is considered good air quality?

Good air quality achieves an AQI from 0-50 and is considered little or no health risk.
Though air quality is acceptable, there are still pollutants present and there may be a moderate health concern for a very small number of people.

You can learn more about AQI from this link below:
https://www.iqair.com/us/us/newsroom/what-is-aqi