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The Air Quality Regulations 1997
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- 1997 No. 3043
- SCHEDULE
- Regulation 9
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Interpretation
9. A 15 minute mean is a mean calculated every 15 minutes. The 15 minute mean for a particular substance at a particular location for a particular 15 minutes is the mean of the levels recorded, at a frequency of not less than once every 10 seconds, for that substance at that location during that 15 minutes.
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