Cars emit carbon monoxide (CO), nitrogen oxides (NOx), and volatile organic compounds (VOCs), all of which contribute to air pollution. One of the most concerning pollutants is carbon monoxide, a colorless, odorless gas produced during the incomplete combustion of fossil fuels. Vehicles that run on gasoline or diesel are significant sources of CO emissions. Once released into the atmosphere, carbon monoxide can react with other chemicals to form ground-level ozone, which is a key component of smog. The negative health effects of these pollutants include respiratory problems, cardiovascular issues, and exacerbated climate change, highlighting the importance of sustainable transportation solutions.