Ambient air quality evaluation published in the yearbook covers the whole territory of the Czech Republic. It is necessary to document the compliance with the legislative requirements also in the areas where none of the limit values is exceeded, and namely in accordance with one of the fundamental principles of the Directive 2008/50/EC. Where the objectives for ambient air quality laid down in this Directive are not met, the member states should take action in order to comply with the limit values and long-term objectives.

The level of air pollution is documented mainly in maps of spatial distribution of air pollution characteristics. Measuring stations are marked with symbols of different shape according to the type of locality, and the concentration levels are indicated with the colour of the symbol. The exceedance of the limit value is marked with red colour, further basic thresholds between the categories include the lower assessment threshold and upper assessment threshold.

The diagram maps depict clearly the development of air pollution characteristics in the period 2003–2013, the exceedance of the limit value in 2013 is highlighted with the red name of the respective station. The courses of concentrations of individual pollutants at selected stations during the year 2013 are documented by the graphs.

The graphs of trends of air pollution characteristics of selected pollutants in agglomerations and in the whole territory of the Czech Republic starting from the year 1996 show the long-term development of the level of ambient air pollution. The values depicted in the graphs are calculated as the average from average concentrations only of those monitoring stations in the given territory which measured the monitored pollutant for the whole evaluated period.

The tables in the annex present individual pollutants in the localities with the highest air pollution characteristics in 2013 (the values listed downwardly), the grey colour of the background highlights the exceedance of the limit value.

The ambient air quality evaluation is founded on the concentrations measured at monitoring stations. The measuring network is densest in the areas with the highest levels of pollutants’ concentrations, nevertheless it covers the whole territory of the CR.

The backbone network of monitoring stations is represented by the National air pollution network (SIS) operated by CHMI. It includes both the automated monitoring stations (AMS, AIM) and the manual stations (MIM) from which the obtained samples are analyzed in CHMI laboratories. In many cases, in one locality parallel ambient air pollution monitoring is carried out using both automated and manual methods. The National air pollution network is supplemented with monitoring stations of other organizations and their measurement results are also used for ambient air quality evaluation.

New calculation criteria pursuant to Annex I to the Directive 2008/50/EC and Annex IV to the Directive 2004/107/EC were implemented for air quality evaluation in this yearbook. The above annexes set the data quality objectives for ambient air quality assessment. Pursuant to Annex I to the Directive 2008/50/EC and Annex IV to the Directive 2004/107/EC only data from the measuring stations may be used for ambient air quality evaluation for which the requirement for minimum data capture amounting to 90 % is fulfilled. The requirements for the calculation do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation. Without prejudice to Annex I to Directive 2008/50/EC, the criteria set in Annex XI of the same directive shall be used when aggregating data and calculating statistical parameters. Due to these changes some of the data presented in previous yearbooks may slightly differ as compared with the data presented in this yearbook.


The production of maps of air pollution characteristics and ambient air quality evaluation are based on the EoI classification of measuring stations (Table XI.2). This official European classification has been implemented in all localities in the CR registered in the Air Quality Information System (ISKO) database. The complete EoI classification of localities consists of three fundamental letters divided by strokes showing the type of the locality, the type of the area and the characteristic of the area. The third column shows only the examples of the combinations for area characteristics; in fact, any logical combination is possible, however, the first letter has the highest priority. Further information on station classification incl. the new legislation is presented in the 2013 “Summary Tabular Survey” (CHMI 2014b).

The number of monitoring stations of basic pollutants operated by selected organizations, from which the data are stored in the ISKO database from, has been continuously changing since 1969. The greatest number of stations was operated in the 80’s and 90’s of the 20th century. At present most stations are operated by CHMI within the National air pollution network (Fig. XI.2).

SIS includes also four “hot spot” stations; this term is usually used for the localities with high levels of air pollution. The yearbook uses this name for the stations focused exclusively on the monitoring of traffic influence on ambient air quality. Monitoring stations with “hot spot” classification are operated by CHMI in the localities with heavy traffic loads in Prague, Brno, Ostrava and Ústí nad Labem.


The concentrations measured by all monitoring networks are stored in the ISKO air pollution database. The data has been stored in ISKO since the beginning of the measurement, the concentrations of sulphur dioxide and suspended particles obtained from CHMI station networks in northern Bohemia and in Prague has been stored since 1971.

ISKO has been continuously developed and operated on the basis of state-of-the-art information technologies as an integrated system for nation-wide comprehensive evaluation of the state and development of air pollution; the system includes the collection, storage and processing of data from air pollution automated and manually-operated measuring networks in the Czech Republic (air pollution database), as well as the storage and processing of data on emissions and air pollution sources (emission database). The former Air Pollution Information System (IIS) has become an integral part of ISKO, as have other air quality information systems on the agenda, especially the system of collection, processing and storage of data on individually registered air pollution sources and also the database on chemical composition of precipitation and atmospheric deposition. Together with air pollution data also supplementary meteorological data measured at the great number of CHMI automated stations are stored in the air pollution database, and they are used for the evaluation of air pollution-meteorological relations.

In addition to the results from CHMI measurements ensured by the staff of air pollution monitoring departments in the centre and in the branches, the ISKO air pollution database includes also data provided by the cooperating institutions, and mainly by health institutes, Czech Energetic Works, a. s. (CEZ), Forestry and Game Management Research Institute, p.r.i., Czech Geological Survey, Water Management Research Institute TGM, p.r.i., Hydro-biological Institute, municipal authorities and other contributors (Table XI.1). The database also includes the information from the boundary areas in Germany and Poland.


Methodical development and annual nation-wide processing and keeping of records of the emission database are guaranteed by CHMI. In the time series starting approx. in 1984, there are stored in the ISKO emission database the annual overviews of emission data and supplementary technical data from the operators of the most significant group of facilities (formerly extra large and large sources called as REZZO 1). Starting from the 90’s of the 20th century the database includes also the data from the sources listed by the previous legislation among the so called medium-sized air pollution sources (formerly REZZO 2 sources). The collection of reported data from stationary sources, newly specified in Annex No. 2 of the Air Protection Act, is carried out through the Integrated system of the fulfilment of notification obligations (ISPOP) implemented by Act No. 25/2008 Coll., on the integrated pollution register and the integrated system of the fulfilment of notification obligations in the field of environmental protection, and amendments to several acts.

The new classification of facilities into the REZZO 1 and REZZO 2 categories is based on the form of the reported data of summary operational records for the year 2013 where for approx. 40 % of the reported data the so called simplified form was used (the conditions are set in the introductory text of Annex No. 11 to the Decree No. 415/2012 Coll., on permissible level of pollution and its ascertainment and on the implementation of several other provisions of the Air Protection Act describing the list of data of the summary operational records).


Since 1997 emissions from local household heating units are inventoried according to the methodology based on the General Census data. The General Census data are regularly (once a year) updated in cooperation with the regional suppliers of fuels and energy. At present the modified method of the year 2006 is used (Machálek, Machart 2006), and the 2011 General Census data are included.

The final output of the model consists in data on emissions of pollutants and on fuel composition for household heating units at local level included in the database REZZO 3. In addition to data on local household heating, also data on emissions from other stationary sources, not listed in Annex No. 2 of the Air Protection Act, comprising the mass use of solvents, agricultural and building activity, are re-calculated in the REZZO 3 database.

The inventory of emissions from mobile sources (REZZO 4) covers road, railway, water and air transport processed by the Transport Research Centre (CDV) in Brno based on their own method and off-road mobile sources (agriculture, building industry etc.) processed with the use of the data on fuel consumptions (CSO) and emission factors based on the VÚTZ Prague method.


ISKO is linked to data sources and cooperating systems, mainly to air quality monitoring networks, sources of reported data and to cross-sectional information systems. The interconnection is carried out mainly through the exchange of data by e-mail, on magnetic media, over switched data lines and, in case of data from the automated air pollution monitoring networks, mainly over radio transmission (Fig. XI.1).

The selected information, tables, graphs and maps both from the ”Summary Tabular Survey” and the graphic yearbook “Air Pollution in the Czech Republic in 2013”, are accessible in CHMI website (http://www.chmi.cz), where you can find other overviews relevant to ambient air pollution. Under “Air Quality” there are also presented, with a short time lag, the current results of measurements from automated stations operated by CHMI and other organizations in the form of tables, the so called air quality index, graphs and estimate of spatial distribution of PM10, SO2, NO2 and O3 concentrations.

Tab. XI.1 Air pollution monitoring localities, based on the owner, Czech Republic, 2013

Tab. XI.2 Exchange of Information (EoI) station classification


Fig. XI.1 Scheme of ISKO’s links to data sources and co-operating systems 2013

Fig. XI.2 Monitoring of basic pollutants in selected organisations – development