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Despite smoking fewer cigarettes per day and attempting to quit more frequently, Black smokers are more likely to die from tobacco-related diseases and tend to have higher levels of cotinine, a metabolite formed after nicotine enters the body, denoting a recent exposure to cigarette smoke, in their systems

Of special concern is fine particulate matter (PM2.5) airborne particles from engines and other emissions that are less than 0.033 the diameter of a human hair

PMID 9176984

I used to stand in Discount Records on Telegraph Avenue, and read Hentoff, Gleason and Feather to absorb this information which was unavailable elsewhere