Supply of Gases to the Air Quality Monitoring Network

The Environment Agency (EA) requires the supply of gas cylinders to a number of Automatic Urban and Rural Network (AURN) air quality monitoring sites distributed across the UK to enable analysis of air pollution. The current number of AURN sites requiring the supply of gases is around 160. There will be an additional 104 PM2.5 sites delivered through the PM2.5 expansion over the next 3 years, however, only 89 of these are completely new sites. Also not all of the 89 sites will require gases, only those that have ot...