Issues of poor air quality are often highly localised: the 31 non-compliant sections of the Strategic Road Network represent about 51 miles of road, out of the 4,500 managed by National Highways.13 National Highways estimates about 240 to 250 houses or properties are directly affected by these exceedances, as many are not in urban areas, and levels of NO2 drop off quickly away from the road.14 Tackling these exceedances will require interventions that may be unpopular with local residents; Na...

Issues of poor air quality are often highly localised: the 31 non-compliant sections of the Strategic Road Network represent about 51 miles of road, out of the 4,500 managed by National Highways.13 National Highways estimates about 240 to 250 houses or properties are directly affected by these exceedances, as many are not in urban areas, and levels of NO2 drop off quickly away from the road.14 Tackling these exceedances will require interventions that may be unpopular with local residents; National Highways told us that it is looking at developing two nine-metre-high barriers in the centre of Guildford, which is the location with the most sev Type: conclusion | Number: 15 | Response status: not_addressed