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Sulphur Dioxide (London)

Volume 173: debated on Tuesday 5 June 1990

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To ask the Secretary of State for the Environment how much sulphur dioxide there is on average and at maximum levels in the air in London.

As part of the national pollution monitoring network, SO2 is measured at two sites in London. The provisional annual mean and peak concentrations (in parts per billion) for 1989–90 are as follows:

SiteAnnual meanPeak
Cromwell Road16·6185
Central London10·7226
Data for peak values should be viewed in the context of international agreements protecting human health, which specify mandatory concentration limit values linked to exposure for a period of time. SO

2 concentrations are controlled by EC directive 80/779; the limit values it specifies have never been breached in London since the directive came into force.