Scientists' Contributions

Table 1: UK Air Quality Objectives for the purposes of air quality management (from HM Government, 2000)

Pollutant	Concentration	Measured as	Date to be achieved by
Benzene	16.25µg/m3	Annual mean	2003
1,3-butadiene	2.25µg/m3	Annual mean	2003
Carbon monoxide	11.6mg/m3	Running 8-hour mean	2003
Lead	0.5µg/m3 0.25µg/m3	Annual mean	2004 2008
Nitrogen dioxide	200µg/m3	Hourly mean	2005 (18 exceedances allowed)*
	40µg/m3	Annual mean	2005*
Particulates (PM10)	50µg/m3	24-hour mean	2004 (35 exceedances allowed)
	40µg/m3	Annual mean	2004
Sulphur dioxide	266µg/m3	15-min mean	2005 (35 exceedances allowed)
	350µg/m3	1-hour mean	2004 (24 exceedances allowed)
	125µg/m3	24-hour mean	2004 (3 exceedances allowed)

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Note: UK deadlines refer to the end of the year in question

    * provisional objective only

Scientists' Contributions

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