§ Dr. David Clarkasked the Secretary of State for the Environment if he will make a statement about the levels of nitrogen dioxide at roadside monitoring sites in London; and what information he has about comparable EEC air quality standards.
§ Mr. WaldegraveThe results of kerbside monitoring in London of levels of nitrogen dioxide are published annually as a supplement to the "Digest of Environmental Projection and Water Statistics" and placed in the Library of the House. Data over the last four years for kerbside site 1 are given here and include figures for 1985 due to be published in May.
NO2, Concentrations Expressed as Parts Per Billion 1982 1983 1984 1985 Annual Average 46 65 49 48 Maximum Monthly 99th Percentile of hourly average concentrations 220 330 158 200 Monitoring for the purposes of EEC directive 85/203/EEC, air quality standards for nitrogen dioxide, should be as far as possible representative of the individual risk of exceeding the limit value. (98th percentile of hourly average NO2 concentrations per year of 200 micrograms per cubic metre, 104.6 parts per billion). Because the general public spend only a limited amount of time at the kerbside such areas are not considered relevant for monitoring with regard to the directive.