Air quality. Daily data since 2001

The Comprehensive Air Quality System of the City Council of Madrid allows to know at all times the levels of air pollution in the municipality. In this dataset you can obtain the information collected by air quality monitoring stations, with daily data by annuities since 2001. (In the current year the information will be updated monthly). The daily values published in the open data portal are calculated as an arithmetic mean of the 24 hourly values of each day. The air quality legislation establishes, for each of the regulated pollutants, different limit or target values expressed as hourly, daily, eight-hour and annual averages. Other air quality datasets are also available on this portal: Air quality: Real-time data Air quality. Timetable data since 2001 Air quality: Control stations You can also find more information about this data in the Transparency Portal > Air .