Old sensor gives strange values

Sensors Troubleshooting
4

Who is your local air quality authority? And you have PA-II Classic sensors, not Flex :slight_smile:

You might try setting the map as follows, if you are looking for PM2.5 in μg/m³ to compare with locally calibrated equipment:

  • Data layer: Raw PM2.5
  • Apply conversion: US EPA

It may be difficult to get close agreement if your air pollutants require specialized correction factors. US EPA’s adjustment was developed with wood smoke as a primary pollutant.

You might also try performing the sensor maintenance described here, especially if the A and B sensors are wildly different:

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