DfT explained to us that the national model ‘fills in the gaps’ in data collected by its monitoring stations to create a kilometre by a kilometre map of air quality across the country, and forecasts to 2030.23 DfT also told us that the results of the national model are updated to account for local experience; for example, in Southampton the local authority found that the national model underestimated NO2 compared to the results of local monitoring, due to a different fleet mix than predicted,...

DfT explained to us that the national model ‘fills in the gaps’ in data collected by its monitoring stations to create a kilometre by a kilometre map of air quality across the country, and forecasts to 2030.23 DfT also told us that the results of the national model are updated to account for local experience; for example, in Southampton the local authority found that the national model underestimated NO2 compared to the results of local monitoring, due to a different fleet mix than predicted, so the model was updated.24 Type: conclusion | Number: 18 | Response status: not_addressed Government response: 2.1 The government agrees with the Committee’s recommendation Recommendation implemented 2.2 The government is satisfied that the best available evidence that meets the stringent requirements for assessing compliance with the annual mean Nitrogen Dioxide (NO ) limit 2 value under the Air Quality Sta