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The problem with the smog situation is twofold especially in large cities,whereby a prodigious autombiles are being driven and the second if the city sits down in a valley where pollutants just settle and flow of air currents is not present on a very hot day. The only way to alleviate the smog is through rain or heavy windsor having cooler temperatures.
China is a country now more dependent upon oil consumption,so more automobiles are being driven they use to ride bikes mostly before,so more cars are causing more pollution,therefore more smog.
I don't think that this is true today, but at one time the City of Gary, IN was the most polluted city in the world. But I believe that was before China started to industrialize and become polluted with smog. I really do not follow pollution status.
I visited China 10 years ago, and Beijing had pretty bad air pollution at that time. LA is plenty bad, but not as bad as Beijing. Bejing has more bad particulate air pollution than most places. I rode a bike all around the city and used a dust filter mask like thousands of other people do. After a just a few hours the front of the dust filter mask was pretty dirty, and it was not a bad smog day. In Beijing, most people used to cook meals on a stove that used round little bricks that look like coal that has been compressed with perforations (so that it burns better). I noticed a lot of "soot" from those millions of coal burning cooking stoves.
You left Houston and Mexico City off the list? Why is Berlin on this list? Berlin should be on the list of large cities with the clean air.
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