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PM2.5 to AQI Converter Calculator
Convert a PM2.5 concentration in micrograms per cubic metre to the US Air Quality Index.
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Convert a PM2.5 concentration in micrograms per cubic metre to the US Air Quality Index.
PM2.5 to AQI Converter Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: Use a 24 hour average when comparing with official AQI values.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
PM2.5 Quick Guide
Typical values for reference.
| AQI | Category | PM2.5 | Advice |
|---|---|---|---|
| 0 to 50 | Good | 0 to 9 | Enjoy |
| 51 to 100 | Moderate | 9.1 to 35.4 | Sensitive caution |
| 101 to 150 | Unhealthy sensitive | 35.5 to 55.4 | Limit |
| 151 to 200 | Unhealthy | 55.5 to 125.4 | Avoid |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
PM2.5 to AQI Calculator FAQ
Answers to common questions about this calculator.
An index of air quality from 0 to 500.
Current US EPA PM2.5 breakpoints.
Yes, scales vary.
N95 helps at high AQI.