Skip To Content

Air quality

Air quality

Improving the environment in Calderdale is a priority for the Council. It is fundamental to our Vision 2024 ambition of the place we want to be in the future.

The dashboard displays the live feed from the air quality stations around Calderdale. These measure:

  • NO2 (nitrogen dioxide) – a gaseous pollutant associated with combustion and chemical processes in the atmosphere;
  • PM10 – a particulate matter or very fine dust with a maximum effective diameter of 10 micrometres;
  • PM2.5 – a particulate matter with a maximum effective diameter of 2.5 micrometres (a quarter of the PM10).

All measurements are shown in micrograms per cubic metre.



Both PM10 and PM2.5 are associated with combustion (including engines). PM2.5 has a significant long range component – the source can be a long way from where the measurement is taken. PM2.5 is of particular interest as it can pass through the lungs into the blood stream.

For historical data from all three monitoring stations, see the Air quality monitoring stations datasets.

For more information on Calderdale’s air quality, see Calderdale Council: Air quality.