The pollutants included in the Welsh Air’s SOS are listed below. Pollutant nomenclature and controlled vocabulary used is managed controlled by the European air quality e-Reporting initiative
| URL | LABEL |
|---|---|
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/1 | Sulphur dioxide in air |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/5 | PM10 in aerosol |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/7 | Ozone in air |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/8 | Nitrogen dioxide in air |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/9 | Nitrogen oxides in air |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/10 | Carbon monoxide in air |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/38 | NO - recommended unit: µg/m3 |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/6001 | PM2.5 in aerosol |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/6400 | Volatile PM10 (Hourly measured) |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/6401 | Non-volatile PM10 (Hourly measured) |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/6410 | Volatile PM2.5 (Hourly measured) |
| http://dd.eionet.europa.eu/vocabulary/aq/pollutant/6411 | Non-volatile PM2.5 (Hourly measured) |