A Question I got via PM

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If I can't prove which chinese guy is producing the N02 that's floating into my backyard, what is government going to do?

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Require the chinese guy to hook a NO2 monitor to his smokestack and require him to only emit so much NO2. This is extremely common for dischargers.

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1) The US government is regulating chinese polluters?

2) how is setting a limit for polluters stopping NO2 from getting in my backyard? Would you be OK with a regulation that allowed me to kick you in the nads as long as I kept the number of kicks below some arbitrarily-determined "acceptable limit" (and in fact, prohibited you from doing anything about it unless I exceeded the recommended allowance)?