Emissions from stationary sources, mostly sulphur dioxide (SO₂) and carbon monoxide (CO) form when different kinds of fuel is burned in the city's co-generation stations and boiler plants, as well as in private homes, industrial enterprises and  other heating facilities. However, recently, emissions from stationary sources in the city have diminished due to closing down of many industrial enterprises (see Figure 3). Remarkable reducing of SO₂ emissions during last years in Riga is caused by changing from fuels with high sulphur content (coal, heating oil) to clean environmentally friendly fuel - natural gas.

Nevertheless, not all polluting substances follow the tendency of decline. The amount of SO₂ emissions fluctuates year by year due to low quality coal burned in boiler plants and private houses.

According to data obtained from the European Bioindicator Monitoring programme, the highest levels of vanadium are registered around Riga's co-generation station TEC 2.