SCHEDULE 2Limit values

Regulation 17(1) and (2)

Sulphur dioxide

Averaging period

Limit value

One hour

350 μg/m3 not to be exceeded more than 24 times a calendar year

One day

125 μg/m3 not to be exceeded more than 3 times a calendar year

Nitrogen dioxide

Averaging period

Limit value

One hour

200 μg/m3 not to be exceeded more than 18 times a calendar year

Calendar year

40 μg/m3

Benzene

Averaging period

Limit value

Calendar year

5 µg/m3

Lead

Averaging period

Limit value

Calendar year

0.5 µg/m3

PM10

Averaging period

Limit value

One day

50 µg/m3, not to be exceeded more than 35 times a calendar year

Calendar year

40 µg/m3

PM2.5

Averaging period

Limit value

Margin of tolerance

Date by which limit value is to be met

Calendar year

25 μg/m3

20% on 11th June 2008, decreasing on the next 1st January and every 12 months thereafter by equal annual percentages to reach 0% by 1st January 2015

1st January 2015

Carbon monoxide

Averaging period

Limit value

Maximum eight hour daily mean(1)

10 mg/m3

(1)

The maximum daily eight hour mean concentration of carbon monoxide must be selected by examining eight hour running averages, calculated from hourly data and updated each hour. Each eight hour average so calculated will be assigned to the day on which it ends, that is, the first calculation period for any one day will be from 17:00 on the previous day to 01:00 on that day, the last calculation period for any one day will be the period from 16:00 to 24:00 on that day.