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Highways England monitor air quality using specialist equipment installed on the Dartford Crossing and surrounding road network. The monthly data they produce forms part of Highways England’s annual Air Quality Management Plan. This informs their strategic assessments and policy.
Highways England do not have monitoring sites outside the Strategic Road Network in the area of the Crossing.
The results of the modelling suggest that following the opening of LTC there will be no perceptible change in pollutant concentrations along the A2 and on Bob Dunn Way. There would be small improvements in pollutant concentrations along A225, A296, A226, and A296. On the M25 corridor itself, there are predicted to be larger improvements in air pollutant concentrations due to a reduction in congestion.
As part of the Development Consent Order application for LTC, Highways England are preparing an Environmental Statement which will include a detailed air quality assessment, to identify the effects and any mitigation measures required. The results of this detailed assessment will be fully reported within the Environmental Statement.