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| Averaging period | Limit value | Margin of tolerance | Date by which limit value is to be met | |
|---|---|---|---|---|
1.24-hour limit value for the production of human health | 24 hours | 50μg/m3 PM10 not to be exceeded more than 7 times a calendar year | To be derived from date and to be equivalent to Stage 1 limit value | 1st January 2010 |
2.Annual limit value for the protection of human health | Calendar year | 20μg/m3 PM10 | 50% on 1st January 2005 reducing every 12 months thereafter by equal percentages to reach 0% by 1st January 2010 | 1st January 2010 |