It isn't, but IIRC, the US still has the largest amounts of carbon monoxide, sulphur, etc. Ammonia China may have more off, but I though the US had the largest share of the rest.
Don't want to get into the thread, but CO, SO2, and ammonia aren't real problematic. not even particles are, in the global sense. In the global sense, water pollution, and heavy metals come into play more.
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