Analysis of air pollution trends is important to determine the effect of air quality management interventions and progress towards the attainment of air quality objectives. The LAQN index tracks changes in annual mean pollution concentrations at a sample of long-term monitoring sites. The index was set to 100 for each pollutant during the year ending November 1996. Measurements of PM10 used in the index calculation were all made by TEOM instruments and thus the index is not directly affected by recent changes in the PM10 measurement method at some sites in London.

Provisional results for the LAQN air quality index for 2010 show:

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Item date 18/02/2011