Bristol only exceeds the legal compliance levels for NO2 and the government directive to the Council is focused on NO2 only. Therefore, measures proposed by the Plan will be designed specifically to tackle NO2. Some measures to reduce NO2 may also impact on levels of other pollutants, and any changes to particulate matter (PM) or CO2 concentrations due to this project will be identified within the technical assessment. Actions to reduce PM concentrations will be set out in the clean air plan.