Annually produced 1x1km background concentrations from Department for Environment, Food and Rural Affairs (Defra) national Pollution Climate (PCM) models. These are typically (but not uniquely) annual mean concentrations. The download webpage shows the years available for each pollutant and provides additional information on the relevant units/metrics. The model results are used in conjunction with measured concentrations from Defra's national monitoring networks to provide an air quality assessment that is reported to the European Commission in accordance with European Directives. The methodology and results are described in a mapping report published by Defra on UKAIR website. Note that these background maps are distinct from the source sector split concentration maps produced for Local Air Quality Management (LAQM) purposes and should not be used for LAQM operations.

Dataset Name: Air Pollution - Particulate Matter 2.5Data Owner: DEFRAContact: opendatani@nidirect.gov.ukSource: Data.gov.ukSource URL: https://uk-air.defra.gov.uk/data/laqm-background-mapsUploaded to SPACE Geoportal: 01/06/2023Update Frequency: when available via DEFRAScale Threshold: N/AProjection : Irish GridFormat: Esri Feature Layer (hosted) Point dataNotes:Point data covering NI from the DEFRA website. Please take time to read the guidance linked below.Please note: These background mapped data are specifically for LAQM purposes only. Please use them in conjunction with reading the Background Maps User Guide. 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.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.For more general interest in UK air quality mapping please visit the UK Ambient Air Quality Interactive Map

Dataset Name: Nitrogen Dioxide Data Owner: DEFRAContact: https://www.gov.uk/government/organisations/department-for-environment-food-rural-affairs#org-contactsSource: Data.gov.ukSource URL: https://uk-air.defra.gov.uk/data/laqm-background-mapsUploaded to SPACE Portal: 23/01/2023Update Frequency: see DEFRA websiteScale Threshold: N/AProjection : Irish GridFormat: Esri Feature Layer (hosted) Point dataNotes:Please note: These background mapped data are specifically for LAQM purposes only. Please use them in conjunction with reading the Background Maps User Guide. 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.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.For more general interest in UK air quality mapping please visit the UK Ambient Air Quality Interactive Map

Monthly and annual average NO2 mean concentrations (µg/m3) from diffusion tubes across Cheshire East. NOTE - a figure of zero (0) indicates that there is no data for that month. All raw data is subject to Defra approved bias corrections and distance corrections where applicable. These two corrections are applied to the end of year annual average not the monthly data. As such the annual average will be different from the running average. Air Quality Management Area boundaries are also included on the map.

Locations of Bristol City Council operated air quality monitoring sites, which defines the areas of poor air quality in Bristol. Data displayed is annual nitrogen dioxide (NO2) concentrations measured using diffusion tubes. Green dots indicate concentrations, for the latest year of data available, below the national annual objective for this pollutant of 40 ug/m3. Yellow indicate concentrations between 40 ug/m3 and 60 ug/m3 and exceed the annual objective for this pollutant. Red dots show those locations with concentrations greater than 60 ug/m3. Data are bias adjusted and annualised where required. Full details of air quality monitoring results are reported to Defra on an annual basis. The most recent reports on air quality in Bristol are available for download at: https://www.bristol.gov.uk/pests-pollution-noise-food/air-quality