The purpose of this report is to review air quality in London during the 2nd quarter of 2002 and to report detailed measurement results for the year ending 30th June 2002.

During May, the three Sutton monitoring sites were closed and the Kensington and Chelsea 5 site became operational.

Measurements during the 12 months ending 30th June 2002 have been compared to the Air Quality Strategy (AQS) Objectives:

The Redbridge 2 kerbside site exceeded the CO objective.

• The annual mean NO2 objective was exceeded at all kerbside and roadside measurement sites. This objective was also exceeded at background locations in inner London and at sites in West London; the Hillingdon AURN site, Hounslow 2 and Heathrow.
• The incident based NO2 objective was exceeded at the kerbside sites Marylebone Road and Redbridge 2, and at the roadside sites Brent 2 and Kensington & Chelsea 3.
• Widespread exceedences of the O3 objective were measured in outer London and at sites in the Home Counties.
• The incident based PM10 objective was exceeded at the kerbside sites Barnet 1, Marylebone Road and Redbridge 3, and at the roadside sites Bexley 4, Brent 2, Enfield 2, Enfield 4, Hammersmith and Fulham 1, Lambeth 1 and Redbridge 4.
• The annual mean PM10 objective was exceeded at Bexley 4, Enfield 4 and Marylebone Road.
• The SO2 objective was not exceeded at any LAQN site.