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I think you can get a general idea of whether or not a city is functioning by the amount of pollution when considering the day of the week, temperature and baseline pollution.
Trying to calculate exactly how many bodies are being burned is difficult. Having a charcoal bbq releases a lot of stuff into the air, too.

Tell me about it. My kid who lives next door got a smoker for Christmas a couple two, maybe three years ago. Sometimes I could send out smoke signal from inside my house. lol