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The Air Quality Standards (Scotland) Regulations 2007

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3.  In this Part–

(a)all values shall be expressed in μg/m3;

(b)the volume shall be standardised at the following conditions of temperature and pressure: 293K and 101.3kPa;

(c)the time shall be specified in Central European Time;

(d)“AOT40” (expressed in (μg/m3).hours) means the sum of the difference between hourly concentrations greater than 80 μg/m3 (which equals 40 parts per billion) and 80 μg/m3 over a given period using only the 1 hour values measured between 08:00 and 20:00 Central European Time each day; and

(e)in order to be valid, the annual data on exceedances used to check compliance with the target values and long-term objectives below must meet the criteria set out in Part 2 of Schedule 12.

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