SCHEDULE 1Air quality standards
PART 4Target values and long-term objectives for ozone
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.
Target values
The attainment date for the target values set out in the following table is 2010, with compliance assessed over the periods indicated for each target value in the table.
Parameter | Target value and assessment for 2010(1) | |
---|---|---|
Target value for the protection of human health | Maximum daily 8-hour mean(2) | 120 μg/m3 not to be exceeded on more than 25 days per calendar year averaged over three years(3) |
Target value for the protection of vegetation | AOT 40, calculated from 1 hour values from May to July | 18,000 μg/m3.hour averaged over five years(3) |
Long-term objectives
Parameter | Long-term objective | |
---|---|---|
Long-term objective for the protection of human health | Maximum daily 8-hour mean within a calendar year | 120 μg/m3 |
Long-term objective for the protection of vegetation | AOT40, calculated from 1 h values from May to July | 6,000 μg/m3.h |