Poland burns a lot of coal in the winter for heating, which results in poor air quality: https://www.reddit.com/r/AirQuality/comments/1b5os4w/what_is_going_on_w

Poland burns a lot of coal in the winter for heating, which results in poor air quality: https://www.reddit.com/r/AirQuality/comments/1b5os4w/what_is_going_on_with_air_quality_in_poland/ https://www.reddit.com/r/AirQuality/comments/1b5os4w/what_is...