Clean Air and Health Matrix

Clean Air Health Matrix
Alternative Title

Air Quality Matrix
Dataset Language

The Clean Air and Health Matrix collates data from a range of health sources including those with a specific clean air focus. The data from each indicator is scored individually at Lower Social Output Area (LSOA) scale before a weighting is applied and the scores combined The combined scores are then ranked by quintile to provide a list of LSOA's which are deemed highest priority through to low priority. The indicators include:
  • Proximity to Air Quality Management Areas (AQMA's), the closer to an AQMA the higher the score. AQMA's are areas where national legal polution levels are exceeded.
  • PM2.5 Concentration - the higher the concentration the higher the score
  • Index of Multiple Deprivation 2019 - an indiex taking factors which enable the identification of the most and least deprived LSOA's in the county. The more deprived an area the higher the score.
  • ACORN Health "Wellbeing" data - a national dataset where health characteristics of communities is analysed. The more health deprived the lower the score.
  • Population number - the larger the population the higher the score
  • Number of sensitive receptors to poor air quality - the more receptors (placed in health and educational settings) the higher the score.
  • Congestion Hotspots - identified congestion points based on 2015/2016 Traffic Master Teletrac data. The more congested points in an area the higher the score
  • Canopy Cover - the lower the canopy cover the higher the score.
Topic Category

Keyword Value: Clean Air and Health Matrix
Originating Controlled Vocabulary: GEMET - INSPIRE Spatial Data Themes (GEMET)
Originating Controlled Vocabulary Citation: 2008-01-01
Temporal Extent

Dataset Reference Date

Date: 28/06/2022
Date Type: revision

The above indicators used to create the matrix come from a range of sources:
  • Proximity to Air Quality Management Areas -DEFRA UK AIR. This is an air information resource (2022).
  • PM 2.5 Concentration -DEFRA UK AIR. This is an air information resource which maps data for local Authorities (2018).
  • Index of Multiple Deprivation - English Indices of Deprivation 2019. Created by the Ministry of Housing, Communities and Local Government (2019).
  • ACORN health "Wellbeing" data -Please see metadata information here. Data created by CACI (2021)
  • Population number -Population Mid Year Estimates 2020. Data owned by the Office for National Statistics.
  • Number of sensitive receptors to poor air quality - taken from internal GIS datasets and includes HCC owned schools, GP Surgeries, Hospital Sites and pharmacies
  • Congestion points -Please see metadata information here.Used data from December 2020, and included Trunk, Primary & Secondary roads and compares average speeds against registered speed limits on approaches to junctions
  • Canopy Cover - Tree Canopy Data based on mapped tree data via the Biodiversity Baseline and uses an indicator for lower canopy cover of 15%

IPR: Ordnance Survey
Hertfordshire County
Vertical Extent

Spatial Reference System

OSGB36 - National Grid of Great Britain
Spatial Resolution

Resource Locator

Internal only - Air Quality Extra Viewer
Responsible Organisation

Hertfordshire County Council - Cleaner Air Programme Management
Role: Resource Provider, Custodian, Owner, Distributor, Originator, Point of Contact, Processor, Publisher, Author.
Limitations on Public Access

Use Constraints

You must use the appropriate Copyright Acknowledgement;
For internal use:
For external use:
For Publicly Available Electronic Copies the following must also be added:
  • The HCC Watermark;
  • The phrase: "Use of this data is subject to terms and conditions." set out in a legible font and conspicuous position must form a clear hyperlink to the Ordnance Survey Copyright

Use of the data is available to any organisation that is a member of the PSGA (Public Sector Geospatial Agreement) or any UK academic institution via Edina's subscription Digimap service. It is not currently commercially available.
This data is supplied without guarantee or any warranty as to the accuracy, currency or completeness, and is provided as is, excluding any warranties of any
kind, either express or implied, to the fullest extent permitted by law,including (but not limited to) satisfactory quality or fitness for a particular purpose.
Additional information

Resource Identifier


Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council
as regards interoperability of spatial data sets and services.
Re-designing HCC Data for INSPIRE not done
Equivalent scale

Bounding box
0.76, 0.22, 51.58, 52.10
Quality scope
Spatial representation type

Character encoding
Data quality
Maintenance information
maintenance and update frequency: AsNeeded
update scope:
maintenance note:
Metadata update date
Metadata Language

Metadata Point of Contact

Hertfordshire County Council - Corporate GIS Team
Resource Type

6 Dataset
File Identifier
Hierarchy level name
Parent identifier
Metadata standard name

Metadata standard version
Review date
Name Long Name Description

OSGB36 National Grid Bounding Coordinates

West: 486000 East: 552000 North: 245000 South: 189000
More Information

Change History