Because of very high air pollution level, the Jagiellonian University students and staff are advised to check the latest information about the air quality and read about the potential health risks:
http://www.airqualitynow.eu/comparing_city_details.php?krakow (in English)
http://www.malopolska.pl/Obywatel/EKO-prognozaMalopolski/Malopolska/Strony/default.aspx (more detailed information in Polish)