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Air Quality Index PM2.5 Health Risk Calculator

AQI bands: Good 0–50; Moderate 51–100; Unhealthy 101–150.

Calculates approximate AQI from PM2.5 concentration and shows ratios to WHO and US EPA guidelines. Outputs a simplified AQI score for the measured concentration.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

AQI = piecewise linear interpolation per EPA bands; WHO limit = 15 μg/m³

In depth

Calculates approximate AQI from PM2.5 concentration and shows ratios to WHO and US EPA guidelines. Outputs a simplified AQI score for the measured concentration.