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The Air Quality Limit Values (Scotland) Regulations 2003
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PART VICARBON MONOXIDE
6.1
| Averaging period | Limit value | Margin of tolerance | Date by which limit value is to be met | |
|---|---|---|---|---|
| Limit value for the protection of human health | Maximum daily 8-hour mean | 10mg/m3 | 4 mg/m3 reducing on 1st January 2004 to 2 mg/m3, and to 0 mg/m3 on 1st January 2005 | 1st January 2005 |
6.2 The maximum daily 8-hour mean concentration shall be selected by examining 8-hour running averages, calculated from hourly data and updated each hour. Each 8-hour average so calculated shall be assigned to the day on which it ends, i.e. the first calculation period for any one day shall be the period from 17:00 on the previous day to 0100 on that day; the last calculation period for any one day shall be the period from 1600 to 2400 on that day.
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