Is diesel or unleaded exhaust more deadly to breathe?

Diesel exhaust is generally considered more harmful to breathe than unleaded gasoline exhaust due to its composition, which includes a higher concentration of particulate matter, nitrogen oxides, and harmful hydrocarbons. Diesel particulate matter is particularly toxic and has been linked to serious health issues, including respiratory diseases and cancer. While both types of exhaust are harmful, the long-term exposure risks associated with diesel fumes are typically greater.