These Regulations set binding air quality targets, the date by which they are to be achieved, and how to be measured. The air quality targets are: 1) the annual mean concentration target of PM2.5 (fine particulate matter) in ambient air (Regulation 4); and 2) the population exposure reduction target a long-term target to reduce population exposure to PM2.5. (Regulation 7). Regulations 6 and 9 set the reporting date for each target for the purposes of section 6(1) of the Environment Act 2021. Part 4 and Schedule 2 contain provisions about monitoring and assessment which apply in relation to both targets. Part 5 and Schedule 3 contain provisions about information to be published.