asked 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.
The 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|
|Maximum Monthly 99th Percentile of hourly average concentrations||220||330||158||200|
2 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.