Air Quality Indicators
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2007Metadata
- High level information
- Summary information
- Weblinks
- Statistical quality information
- Keywords
- Open Data
Title
Air Quality Exposure IndicatorsLast update
July 2022Next update
November 2023 (provisional)Publishing organisation
Welsh GovernmentSource 1
Air Concentration, Department for Environment, Food and Rural AffairsSource 2
Small area population estimates (SAPE), Office for National StatisticsSource 3
Geographical information, Welsh GovernmentContact email
stats.environment@gov.walesDesignation
NoneLowest level of geographical disaggregation
Local authoritiesGeographical coverage
WalesLanguages covered
English and WelshData licensing
You may use and re-use this data free of charge in any format or medium, under the terms of the Open Government License - see http://www.nationalarchives.gov.uk/doc/open-government-licenceGeneral description
Air Quality Exposure Indicators - average NO2, PM2.5 and PM10 concentrations across local authority areas and health board areas, derived from modelled data for each square kilometre in Wales, measured in µg/m3 (DEFRA data)Data collection and calculation
Each year the UK Government’s Pollution Climate Mapping (PCM) model calculates average pollutant concentrations for each square kilometre of the UK. The model is calibrated against measurements taken from the UK’s national air quality monitoring network.The Welsh Government has used this published data to assign a concentration of NO2, PM2.5 and PM10 to each residential dwelling in Wales based on which square kilometre of Wales it sits in.
For each census output area (statistical geographic units comprising around 150 properties), the pollutant concentrations associated with each dwelling within it were averaged to give an average NO2, PM2.5 and PM10 concentration across the census output area.
For each Local Authority and Local Health Board, a population-weighted average over its constituent census output areas were calculated to give an average NO2, PM2.5 and PM10 concentration based on where people live in those Local Authorities and Health Boards. The same calculation was also repeated over all census output areas, to give a comparable figure for the whole of Wales.
Frequency of publication
AnnualData reference periods
Annual averageUsers, uses and context
Information is used for local area air quality management and monitoring.Rounding applied
Population weighted concentrations are rounded to the nearest whole number (µg/m3).Revisions information
None.Statistical quality
See weblinks.Each year the Pollution Climate Model (PCM) which underpin the background maps is refined and improved ( to account for latest available science and understanding e.g. changes in emissions factors, improved activity data etc.). These method changes are usually only applied in the latest year's figures.
2021 air quality figures are based on 2020 population estimates.
