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Description
At times, PM2.5 can be produced from a chemical reaction in the atmosphere

As for gum bleeding, it is not unusual to be a bit overzealous and brush too much but also be aware that your gums are experiencing some rather amazing healing all their own and, surprisingly, it is normal for the ex-smoker's gums to be more prone to bleeding during recovery, not less

Annals of Internal Medicine 163(8):622634

12 AporosaS
Environmental Health Perspectives 106(3) 827-832