Meanwhile, in Eastern Europe: http://airindex.eea.europa.eu http://airindex.eea.europa.eu I am from southern Poland, where in winter time some regions experien

Meanwhile, in Eastern Europe: http://airindex.eea.europa.eu http://airindex.eea.europa.eu I am from southern Poland, where in winter time some regions experience visibility range of less than 200m due to smog. This is due to many factors, including people burning trash to heat their homes, industrial pollution, building over natural green corridors, as well as simply local geography (lots of valleys and basins)