Ozoneweb

You can check the air quality in each country in Europe provides data from the system and compare it to the other at different times of the day through the first link. Through the second you can check the air quality in Sofia

http://www.eea.europa.eu/themes/air/air-quality-index

Several regions of Switzerland will be imposing restrictions on the automobile traffic on account of the ozone peak, caused by the heats over the past several days.

The ticket prices for public transportation have been reduced for the purpose of encouraging citizens to leave their cars behind and hopefully to cause decreased levels of pollution.