Krakow, Poland. 01st Feb, 2017. A general view of the city of Krakow under a smog cloud at Krakow, Poland on February 01, 2017. Today, 15th February, the level of PM is 239 mg/m3 (956% higher than the maximum level).The mayor of Krakow, has offer free public transport due to the high air pollution level. Credit: Omar Marques/Pacific Press/Alamy Live News

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Keywords: 2017, air, alert, city, february, health, higgest, krakow, level, organization, poland, pollution, smog, world