Air quality and air emissions
Statistics on air quality characterise several substance (sulphur dioxide, nitrogen dioxide, ozone and particulate matter) concentration in several stations in Rīga, Liepaja, Rezekne and Ventspils as well as mean, maximum and minimum precipitation acidity in Aluksne, Dobele, Rīga, Skriveri and Rucava.
Data on air emissions are used to estimate amount of polluting substances emitted into atmosphere in Latvia and in several cities and towns, including pollutants emitted into atmosphere due to leaks in technological devices, by measuring this amount or finding it out basing on methodologies approved by the corresponding sector
Terms and definitions
Carbon monoxide (CO)
Particulate matter (PM10)
Particulate matter smaller than ten microns being one of the main air pollutants in Latvia.
The key emitters of PM10 are transport, combustion devices, industrial processes and transboundary flows. Notable PM10 emissions emerge from using anti-slip materials on streets and roads.
Nitrogen oxides (NOx)
Nitrogen oxides (NOX) means nitric oxide and nitrogen dioxide, expressed as nitrogen dioxide (NO2).
Significant pollution is caused by heavy traffic; NOx gases are formed in the vehicle engine – in the combustion process in the presence of nitrogen. NOx gases react, forming smog and acid rain, and causing tropospheric ozone.
Precipitation acidity (pH)
Acid rain or acid precipitation refer to any type of precipitation that is contaminated with acid oxides and has low pH level.
Sulphur dioxide (SO2)
Sulphur dioxide is the chemical compound with the formula SO2.
This gas is the main product forming in the oxidation of sulphur compounds and is of significant environmental concern.
Volatile organic compounds (VOC)
Include wide range of different organic compounds, which have diverse influence on the environment population health.
Relatively they can be divided into two sub-groups: methane (CH4) and non-methane volatile organic compounds (NMVOC).
Volatile organic compounds (VOC) are organic chemical compounds that under normal conditions have vapour pressures high enough to vaporize and enter the atmosphere.
A wide range of carbon-based molecules, such as aldehydes, ketones, and hydrocarbons are VOC.
Emissions from stationary air pollution sources
Survey method and data source
Data on air quality are obtained from the Latvian Environment, Geology and Meteorology Centre. The air quality measurements are taken by means of automatic stations that ensure continuous registration of polluting substances in towns and cities.
Statistics on air emissions are acquired from report 2-Air "Report on air protection".
The Report on Air Protection (2-Air) is submitted by operators which have or in the reference year had valid permit for the pollutive activities of A or B category, or certificate for the pollutive activities of C category, or the activities whereof comply with the Regulation (EC) No 166/2006 of the European Parliament and of the Council of 18 January 2006 concerning the establishment of a European Pollutant Release and Transfer Register and amending Council Directives 91/689/EEC and 96/61/EC and which are emitting pollutive substances listed in the Annex II to the Regulation No 166/2006.
Contact person on methodology
Environment and Energy Statistics Section