Air quality. Daily data since 2001

The Comprehensive Air Quality System of the City of Madrid allows to know at all times the levels of air pollution in the municipality. In this data set you can obtain the information collected by the air quality control stations, with the daily data per annuity since 2001. (In the current year the information will be updated monthly). The daily values published in the open data portal are calculated as the arithmetic mean of the 24 hourly values of each day. The air quality legislation lays down, for each of the regulated pollutants, different limit or target values expressed as hourly, daily, octo-hourly and annual averages. Other datasets related to air quality are also available on this portal: Air quality: Real-time data Air quality. Schedule data since 2001 Air quality: Control stations as well, you can find more information about this data in the Transparency Portal & It’s air.