Before revision: Large-scale pollution monitoring At the opposite end of the spectrum from low-cost sensors are the large, very expensive, static street-side monitoring stations that constantly sample the various different pollutants commonly found in urban air for local authorities and that make up metropolitan monitoring systems such as the London Air Quality Network and a wider British network called the Automatic Urban and Rural Network (AURN).
After revision: An air pollution monitoring station in Shaftesbury Avenue, LondonLarge-scale pollution monitoring At the opposite end of the spectrum from low-cost sensors are the large, very expensive, static street-side monitoring stations that constantly sample the various different pollutants commonly found in urban air for local authorities and that make up metropolitan monitoring systems such as the London Air Quality Network and a wider British network called the Automatic Urban and Rural Network (AURN).