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However, reading and interpreting AQI is a bit of a guessing game. The AQI scale ranges from 0 to 500 and includes different tiers associated with various health risks for different groups of people.

AQI scales vary from good (AQI of 0-50) to moderate (AQI of 51-100), unhealthy for sensitive groups (AQI of 101-150), unhealthy (AQI of 151-200), very unhealthy (AQI of 201-300), and hazardous ...

Moderate air quality is between 51 and 100, or in the yellow band of the AQI scale. Air quality in the moderate range can still be risky for people who are unusually sensitive to air pollution.