The Council measures air pollution at over 70 locations. Two of these sites have continuous analysers. These are expensive machines which give very accurate measurements every 15 minutes. The rest of the monitoring sites use a cheaper and simpler method, called a diffusion tube. One tube is placed at each location every month, and they provide an average pollution level for each month of the year. The diffusion tubes measure a type of air pollution called nitrogen dioxide (NO2).
Government has set objectives for air pollution, which are intended to protect human health. The long-term objective is the level that should not be exceeded as an average for the whole year. This is designed to protect the health of people in places where they spend a lot of time, such as at home or at school. The short-term objective is higher and is measured as an average over 24 hours or 1 hour. It is designed to protect people in places where they spend a short amount of time every day, such as on the pavement or in shopping areas.
An online map showing all Exeter’s monitoring locations can be seen below. Detailed maps can also be found in appendix D of the Annual Status Report available from the https://exeter.gov.uk/airpollution/.
Air quality monitoring
This map shows the locations of our air monitoring stations. Click on a station to see it's name and latest annual recordings of Nitrogen Dioxide.
Further explanation about pollution and the figures for Exeter can be found in this document.