It found that in 2013, 55 percent of Czechs were still being exposed to above-average levels of the toxic chemical benzopyrene. Additionally, many cities suffer from smog and ground level ozone, while heating plants were found to account for 41 percent of dangerous PM10 particulate matter being inhaled by Czechs. 

“The new report once again shows that the air quality in the Czech Republic is very bad. Last year, according to conservative estimates, something like 1,600 people died in the Czech Republic because of air pollution. And additionally, thousands more are sick because of air pollution. This is an issue that the government and city councils need to start dealing with.” 

https://www.radio.cz/en/section/panorama/tackling-the-czech-republics-poor-air-quality