Schedule 2 Limit valuesI1
Northern Ireland
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 |
Carbon monoxide
| Averaging period | Limit value |
|---|---|
(1) The maximum daily eight hour mean concentration of carbon monoxide shall 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, i.e. the first calculation period for any one day will be the period 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. | |
| Maximum daily eight hour meanf1 | 10 mg/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 11 June 2008, decreasing on the next 1 January and every 12 months thereafter by equal annual percentages to reach 0% by 1 January 2015 | 1 January 2015 |
Annotations
Commencement
- I1
Sch. 2 in operation at 11.6.2010, see reg. 1
Footnotes
- f1
(1)
The maximum daily eight hour mean concentration of carbon monoxide shall 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, i.e. the first calculation period for any one day will be the period 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.