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Air Pollution, London

Volume 175: debated on Wednesday 27 June 1990

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To ask the Secretary of State for the Environment if he will make a statement on ozone levels in central London.

The United Kingdom ozone monitoring network includes a site in central London. Between January and June 1990, ozone levels measured at this site averaged 11 parts per billion (ppb). Over the same period, an hourly average of 75 ppb was exceeded on seven occasions, The World Health Organisation hourly guideline value is 75 to 100 ppb.The Department has produced a "Layman's Guide to Low Level Ozone", a copy of which is in the Library of the House.