Legend
| Index | Air quality | SO2 | NO2 | CO | O3 | PM10 |
|---|---|---|---|---|---|---|
| 1h µg/m³ |
1h µg/m³ |
8h µg/m³ |
1h µg/m³ |
1h µg/m³ |
||
| 1 | very good | 0 - 25 | 0 - 25 | 0 - 1000 | 0 - 33 | 0 - 20 |
| 2 | good | > 25 - 50 | > 25 - 50 | > 1000 - 2000 | > 33 - 65 | > 20 - 40 |
| 3 | fair | > 50 - 120 | > 50 - 100 | > 2000 - 4000 | > 65 - 120 | > 40 - 70 |
| 4 | suitable | > 120 - 350 | > 100 - 200 | > 4000 - 10000 | > 120 - 180 | > 70 - 90 |
| 5 | poor | > 350 - 500 | > 200 - 400 | > 10000 - 30000 | > 180 - 240 | > 90 - 180 |
| 6 | very poor | > 500 | > 400 | > 30000 | > 240 | > 180 |
| Component is not measured on this station | ||||||
| Incomplete data | ||||||
The conditions for the determination of air pollution index
The calculation of air quality index is based on the assessment of 1-hour concentration of sulphur dioxide (SO2), nitrogen dioxide (NO2), suspended particles (PM10), 8-hour running concentrations of carbon monoxide (CO) and 1-hour ground - level ozone concentrations (O3) in the summer period (1. 4. - 30. 9.). The calculation considers the possible impact of air pollution on the health of population. The calculation for PM10 uses 1-hour average concentrations because they better reflect the current situation (the limits for 1-hour concentrations were derived on the basis of statistical analysis of 24-hour and 1-hour concentrations).
The 1-hour ozone concentrations (O3) are given in the winter period (1. 10. - 31. 3.) as well, although they are not included in the calculation of air quality index. For information purposes, the last column presents the 24-hour running average concentrations of PM10, which are not included in the calculation of air quality index.
- Data for the calculation of air quality index are based on current measurements and they are not verified.
- Air quality index is determined for each quantity in the given locality separately; the highest of them is presented.
- Air quality index is imaged in case the 1-hour data are available at least for NO2, O3 and PM10 in the summer period (1.4. - 30.9.) or at least for NO2 and PM10 in the winter period (1.10. - 31.3.), if they are subject of standard measurements in the locality.
- The term “incomplete data” may indicate that the instruments at the station were under calibration during the respective hour.
