What key pollutants are measured during the emissions testing process?

The emissions testing process specifically measures carbon monoxide, hydrocarbons, and nitrogen oxides because these pollutants are significant contributors to air quality degradation and are commonly emitted from vehicles.

Carbon monoxide is a harmful gas that forms during the incomplete combustion of fossil fuels, especially in vehicles. It poses serious health risks, such as impairing oxygen delivery in the body.

Hydrocarbons are organic compounds that can lead to the formation of ground-level ozone, which is a key component of smog. Reducing hydrocarbon emissions is essential for improving air quality and protecting public health.

Nitrogen oxides, produced from engine combustion, contribute to smog formation and respiratory problems. They also play a role in forming ground-level ozone and acid rain, impacting both the environment and human health.

Overall, the focus on these three pollutants aligns with regulatory standards aimed at mitigating the environmental and health impacts of vehicle emissions, underscoring their significance in emissions testing.