By R.E. HESTER, R HARRISON
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Additional resources for AIR QUALITY MANAGEMENT
Middleton, 2SZ, and 60220, M eteorological Office, London European Commission, Road, Bracknell, Berkshire R G 12 UK Skouloudis, Environment Institute, TP 250, Ispra (VA), DG Joint /-21020, Research Centre 'Ispra', Italy XI job:LAY01 28-7-1998 page:1 colour:1 black–text Improving Air Quality in the United Kingdom DOUGL AS R. M I DDLET ON* 1 Introduction The concentration of pollutants in urban areas from sources near the ground has become of increasing concern in the UK, particularly since the London pollution episode of December 1991.
R. Middleton, Nomograms for Street Canyons, 1997, submitted to Atmos. Environ. TRL, Design Manual for Roads and Bridges, vol. 11, sect. 3, part 1—Air Quality, Transport Research Laboratory, Department of Transport, amended 1994, HMSO, London, 1995. 3 job:LAY01 28-7-1998 page:4 colour:1 black–text D. R. 94 *When calculating the factors for an average car or light goods vehicle, the assumed percentages of petrol and diesel were: cars 90%P, 10%D; light goods vehicles 50%P, 50%D. cold, the value of q may be much larger than for normal driving.
It is also necessary for them to be checked frequently during their operational lifetime, to 56 job:LAY03 28-7-1998 page:17 colour:1 black–text Ambient Air Quality Monitoring identify drift or degradation. The frequency and type of field calibrations required for any analyser should be defined in the quality assurance plan for the network. A typical scheme would include automatic calibration every 24 hours, using on-site permeation tube ovens or gas cylinders, and manual calibration using independent sources performed during every site visit.
AIR QUALITY MANAGEMENT by R.E. HESTER, R HARRISON