What is the general situation with the air quality in Prague?
Prague has serious problems with air quality. Prague ranks among the three most polluted regions in the Czech Republic, together with North Bohemia and North Moravia. Immission limits (maximum permissible concentrations) of pollutants are exceeded especially in the central part of the city . While yearly averages of sulphur dioxide and suspended particulate matter show a declining tendency, it is not the case of nitrogen oxides.  
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  What is causing the problems?
Air pollution mainly from traffic and also from stationary sources is combined with unfavourable dispersion conditions. But o verall emissions produced by stationary sources, i.e. the amount of pollutants discharged into the atmosphere, have been showing a declining trend since the mid-1980s in Prague. Between 1990 and 1997, the emissions of solids and sulphur dioxide have dropped by approximately 80 %, those of nitrogen oxides by about 70 %. Mobile sources, especially automotive traffic, constitute a major source of pollution. Insofar as some of the polluting substances, such as nitrogen oxides, hydrocarbons or carbon monoxide, are concerned, they represent a dominant source.  
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 What are the impacts of air pollution?
The level of air pollution affect, to a certain degree, sickness level of acute respiratory diseases of  children. Especially mobile sources are sources of compounds with a carcinogenic effect. Pollution have an adverse impact on the quality of surface water and groundwater, building materials, roads and other objects.
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 What is being done to fix the problems?
Since the early 1990s, the Czech Republic has experienced many important changes in the attitude of state authorities toward environmental issues. A number of laws have been passed, institutions of jurisdiction established, the availability of information and public involvement in decision-making processes have improved. In relation to the measures and steps referred to above, many positive changes have also occurred at the local level, including Prague.Essential measures stipulated in conceptual documents of the city (land-use and strategic plans) and aim at improving the air quality include reduced use and burning of solid fuels, conversion to gas, and increased use of district heating systems. Efforts are made to solve problems related to automotive traffic by building a system of ring roads, imposing restriction on vehicular traffic in the city centre, and improving the public transport system. There is a warning and regulatory system in place to cope with critical smog situations. Air quality data is available to the general public, also by means of outputs of the Environmental Information System of Prague.
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 What can an individual do to make a difference ?