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Pollutant

Objective Concentration

Measured as

Date to be achieved by

Benzene

16.25 g/m3

Running annual mean

31.12.2003

5.00 g/m3

Running annual mean

31.12.2010

1,3 Butadiene

2.25 g/m3

Running annual mean

31.12.2003

Carbon monoxide

10.0 mg/m3

Maximum daily 8-hour mean

31.12.2003

Lead

0.5 g/m3

Annual mean

31.12.2004

0.25 g/m3

Annual mean

31.12.2008

Nitrogen Dioxide

200 g/m3 (not to be exceeded more than 18 times a year)

1-hour mean

31/12/2005

(NO2)*

40 g/m3

Annual mean

31/12/2005

Particles (PM10) (gravimetric)

50 g/m3 (not to be exceeded more than 35 times a year)

24-hour mean

31/12/2004

40 g/m3

Annual mean

31/12/2004

50 g/m3 (not to be exceeded more than 7 times a year)

24-hour mean*

31/12/2010

20 g/m3

Annual mean*

31/12/2010

Sulphur Dioxide (SO2)

350 g/m3 (not to be exceeded more than 24 times a year)

1-hour mean

31/12/2004

125 g/m3 (not to be exceeded more than 3 times a year)

24-hour mean

31/12/2004

266 g/m3 (not to be exceeded more than 35 times a year)

15-minute mean

31/12/2005

Notes: µg/m3 mg/m3 *

micrograms per cubic metre milligrams per cubic metre objectives are provisional/not set in the Regulations

4

Table 2.1

Summary of relevant Air Quality Objectives

2.2.1

West Berkshire Council Phase 1 Assessments

WBC have completed Stages 1 to 3 of the phase 1 Review and Assessment process.

The Stage 1 report concluded that further assessment of NO2, PM10 and CO was required due to emissions from road sources. No industrial processes were identified as potentially significant sources of air pollutants.

A DMRB assessment of potentially significant roads in West Berkshire and the A34 Newbury bypass, which was completed during the first round of assessment, was undertaken at Stage 2. The assessment concluded that it was unlikely for the AQOs for PM10 and CO to be exceeded.

h:\projects\em-260\10000 projects\10151 aq w.berks r&a - phase 2\d design\reporting\10151 aq final u&sa.doc10151-01

May 2003

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