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© Crown 2023 copyright Defra via uk-air.defra.gov.uk, licenced under the Open Government Licence (OGL). |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="text-align:Justify;margin:0 0 14 0;"><SPAN>Air pollution background concentration maps are published by Defra and the Devolved Administrations to assist local authorities in carrying out Review and Assessment of local air quality as part of their duties under the Environmental Act 1995 as amended by the Environment Act 2021.</SPAN></P><P STYLE="text-align:Justify;margin:0 0 14 0;"><SPAN>The main purpose of the background maps is to provide estimates of background concentrations for specific pollutants. These can then be used in air quality assessments to better understand the contribution of local sources to total pollutant concentrations. They provide information on how pollutant concentrations change over time and across a wide area; they also provide an estimated breakdown of the relative sources of pollution. The maps allow for the assessment of new pollutant sources that are introduced into an area and the impact they may have upon local air quality.</SPAN></P><P STYLE="text-align:Justify;margin:0 0 14 0;"><SPAN>Background maps are updated by Defra periodically due to updates to underlying data, including emissions factors. Local authorities should use the most up-to-date data and supporting tools made available.</SPAN></P><P STYLE="text-align:Justify;margin:0 0 14 0;"><SPAN>UK background maps are made available for a reference year and projection years for a range of pollutants including oxides of nitrogen (NOx), nitrogen dioxide (NO2) and particulate matter (PM10 and PM2.5).</SPAN></P><P STYLE="text-align:Justify;margin:0 0 14 0;"><SPAN>The current base reference year for the data is 2018 and the projections are available up until 2030 for NOx, NO2, PM10 and PM2.5. Available as 1x1km grid file of concentrations for each local authority (per pollutant). Maps are used for all new air quality assessments.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>These background mapped data are specifically for LAQM purposes only. Please use them in conjunction with reading the </SPAN><A href="https://laqm.defra.gov.uk:443/air-quality-assessment/" STYLE="text-decoration:underline;"><SPAN>Background Maps User Guide</SPAN></A><SPAN>. The projections in the 2018 LAQM background maps are based on assumptions which were current before the Covid-19 outbreak in the UK. In consequence these maps do not reflect short or longer term impacts on emissions in 2020 and beyond resulting from behavioural change during the national or local lockdowns.</SPAN></P><P><SPAN>Only the most recent mapped data should be used for new air quality assessments. Older data can continue to be used for research or on-going assessments.</SPAN></P></DIV></DIV></DIV> |
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Background Air Pollution: PM10 |
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en-GB |
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500000 |
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