Pollutant |
Expressed as |
Limit value [μg.m-3] |
||||
IHr |
IHd |
IH8h |
IHk |
General requirement** |
||
Suspended particulate matter |
SPM |
60 |
150 |
|
500 |
IHd and IHk must not be exceeded in more than 5 % of measurements annually. |
Sulphur dioxide |
SO2 |
60 |
150 |
|
500 |
|
Sulphur dioxide and |
SO2 + SPM |
|
250* |
|
|
|
Nitrogen oxides |
NO2 |
80 |
100 |
|
200 |
IHd and IHk must not be exceeded in more than 5 % of measurements annually. |
Carbon monoxide |
CO |
|
5 000 |
|
10 000 |
|
Ozone |
O3 |
|
|
160 |
|
|
Lead in suspended particulate |
Pb |
0.5 |
|
|
|
|
Cadmium in suspended |
Cd |
0.01 |
|
|
|
|
* Calculated as the arithmetic sum of average daily concentrations of the two components.
** i.e. the 95th percentiles of daily concentrations must not exceed IHd and the 95th percentiles of the half-hour concentrations must not exceed IHk.
IHr - average annual pollutant concentration. Average concentration is understood to be the mean value of concentration, determined at a given site over a time period of one year as the arithmetic mean of average 24-hour concentrations.
IHd - average daily pollutant concentration. Average concentration is understood to be the mean value of concentration, determined at a given site over a time period of 24 hours. Average daily concentration is also understood to be the mean value of at least twelve evenly distributed measurements of average half-hour concentrations over a time period of 24 hours (arithmetic mean).
IH8h - average eight-hour pollutant concentration. Average eight-hour concentration is understood to be the mean value of concentration, as determined at a given site over a time period of eight hours.
IHk - average half-hour pollutant concentration. Average half-hour concentration is understood to be the mean value of concentration as determined at a given site over a time period of 30 minutes.