We monitor air pollution across the Borough. The most concern to us is nitrogen dioxide, which is mainly linked to road traffic.
Monitoring stations
Calderdale has three air quality monitoring stations. They provide hourly data on levels of nitrogen dioxide (NO2) and particulate matter (PM10 and PM2.5 particles) in the air.
This short-term data is collected for the purpose of the local air quality management area (AQMA) and reports.
Monitoring tubes
An air quality monitoring tube is a passive sampler. They are used to monitor ambient air quality over a period of about a month. The tubes primarily test for pollutants like nitrogen dioxide (NO2).
These simple tubes require no power and absorb gases from the surrounding air. After deployment, they are sealed and sent to a laboratory for analysis. The results are used by local authorities to understand pollution levels and inform air quality strategies.
There are 61 tubes monitoring nitrogen dioxide. Calderdale are also taking part in a project monitoring PM2.5 particles and have an additional five monitors located throughout Calderdale.
Zephyr sensors
We have recently established a new network of low-cost Zephyr sensors in some areas of the district. These provide more information about particulate concentrations near homes and schools.
Zephyr sensors provide detailed air quality measurements in real-time. They help identify local pollution hotspots, such as industrial areas.
View air quality monitors on a map
To view monitoring stations, tubes and zephyrs on a map, see: Pollution chambers (Google Maps).