The real reason why the air in North America and Western Europe is cleaner in my opinion is not due to the EPA and other governments environmental agencies it is simply because the majority of the most polluting factories moved to China and other regulation lax nations.
Thing is pollution does not stay in one countries airspace it can be most heavy I suppose do to local weather patterns.China has in the past 10 years or so become much more strict with environmental laws of course their government is rife with corruption.Interesting side note is that China has been heavily investing in African nations for about 20 years now.The reason why should be obvious.
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