This section has no associated Executive Note
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.