Survey of the main pollutants
| name | symbol |
| Sulphur dioxide | SO2 |
| Hydrogen sulfide | H2S |
| Total Particles | DUST |
| Small particles | PM10 |
| Carbon monoxide | CO |
| Carbon dioxide | CO2 |
| Nitrogen dioxide | NO2 |
| Nitrogen monoxide | NO |
| Ozone | O3 |
| Hydrocarbons (minus methane) | CnHm |
| Aromatic hydrocarbons | CxHy |
Number of stations by pollutant and by Region (situation by 01/03/1999)
Regions |
CH4 |
CO |
CO2 |
CxHy |
CnHm |
H2S |
NO |
NO2 |
O3 |
PM10 |
PM2.5 | SO2 |
DUST |
Brussels |
- | 5 |
3 |
- | - | - | 8 | 8 |
5 |
5 |
3 | 8 |
3 |
Flanders |
- | - | - | 3 |
2 |
- | 25 |
25 |
15 |
9 |
1 | 37 |
- |
Wallonia |
3 |
4 |
- | - |
4 |
1 |
11 |
11 |
12 |
7 |
- | 21 |
- |