If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email email@example.com.
Please tell us what format you need. It will help us if you say what assistive technology you use.
This document sets out the performance standard for equipment that monitors pollution in the ambient air (by this we mean the air that we breathe). It covers: nitrogen oxides, sulphur dioxide, carbon monoxide, ozone, particulate matter and VOCs.