Every level, explained plainly
What does your AQI number mean?
The Air Quality Index compresses several pollutants into one number from 0 to 500. These guides translate that number back into decisions: can you run today, should the kids play outside, do you need the mask.
Based on the U.S. EPA AQI scale · Health guidance, not medical advice
The scale
The six AQI categories
Each band carries its own health message. The jump that matters most for most households is 100 to 101 — the point where official guidance starts naming groups of people.
| Range | Category | Risk |
|---|---|---|
| 0–50 | Good | Minimal |
| 51–100 | Moderate | Low |
| 101–150 | Unhealthy for sensitive groups | Moderate |
| 151–200 | Unhealthy | High |
| 201–300 | Very unhealthy | Very high |
| 301–500 | Hazardous | Severe |
Level by level
Is your AQI good or bad?
Pick the reading closest to yours for the full breakdown — outdoor exercise, children, asthma, windows, purifiers and masks.
Is 50 AQI good or bad?
Yes—AQI 50 is good.
Read the guideIs 60 AQI good or bad?
Yes—AQI 60 is generally acceptable.
Read the guideIs 75 AQI good or bad?
Yes—AQI 75 is generally acceptable.
Read the guideIs 80 AQI good or bad?
Yes—AQI 80 is generally acceptable.
Read the guideIs 90 AQI good or bad?
Yes—AQI 90 is generally acceptable.
Read the guideIs 100 AQI good or bad?
Yes—AQI 100 is generally acceptable.
Read the guideIs 120 AQI good or bad?
AQI 120 is bad for sensitive groups, and borderline for everyone else.
Read the guideIs 150 AQI good or bad?
AQI 150 is bad for sensitive groups, and borderline for everyone else.
Read the guideIs 200 AQI good or bad?
Yes—AQI 200 is bad.
Read the guideIs 300 AQI good or bad?
AQI 300 is very unhealthy — treat it as a health alert.
Read the guideKeep exploring
Tools and guides
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