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How to Determine the Error of an Air Quality Sensor?
AirGradient air quality monitoring.
Calculating the average of these differences, the negative and positive values cancel each other out, resulting in a very small error (0.2 µg/m³) which would misleadingly indicate a high sensor accuracy. You can find target values for the performance of low-cost PM2.5 Air Sensors in the testing guidelines of the United States Environmental Protection Agency (US EPA). But they don’t: A study from the US-EPA co-located two commonly used reference instruments (Met One BAM-1020 and Teledyne API T640) and found that, at certain concentration ranges, they diverged by over 25% from each other.
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