I don't know what it "equals" in terms of cigarettes but the ambient pollution is a lot less than deliberate inhalation of cigarette smoke. Smoking a cigarette is designed to introduce the chemicals directly into the airways.
You can see that over time people who live in built-up urban environments (particularly those with heavy dirty industry development) suffer from some lung damage over a long-enough period compared to someone who lives in the wilderness or something, but those who are regular smokers are much worse.



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