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RocketD0g / 2019pm25cityscan.md
Last active September 29, 2020 23:52
Description of Methods for the 2019 OpenAQ PM2.5 City Scan

How annual AVG PM2.5 values were calculated for the OpenAQ 2019 PM2.5 City Scan

Important: The PM2.5 annual average calculations int the OpenAQ 2019 City Scan were performed only with data accessed on OpenAQ. This may not represent the full set of relevant data available in the city or even from the sources sharing data on OpenAQ. There is also considerable variability with the percentage data coverage over the year for many cities. Therefore, these annual averages should not be taken necessarily as representative of a city or as 'official' results from an underlying source.

General

  • City-level averages were generated by averaging data from 1 Jan to 31 Dec 2019.
  • Averages were created by station and then averaged across all stations in a city.
  • The % time data reporting to OpenAQ was calculated by taking the number of data points reported and dividing by the total possible