Which of the following particulate matter is emitted from vehicles?

Step-by-step solution

Particulate matter refers to solid or liquid particles suspended in the air. Among the given options, Lead (Pb) is a well-known heavy metal pollutant emitted from vehicle exhausts, particularly in regions where leaded gasoline was historically used or due to the wear and tear of vehicle components containing lead. Carbon monoxide (CO) is a gaseous pollutant, not particulate matter. Tin (Sn) and Selenium (Se) are not primary particulate emissions associated with standard vehicle exhaust systems. Answer: Pb