Sulfur Dioxide (SO2) is primarily emitted by industrial sources, not vehicles.

Catalytic converters are designed to reduce emissions of Nitrogen Oxides (NOx), Carbon Monoxide (CO), and Hydrocarbons (HC).

Sulfur Hexafluoride (SF6) is a potent greenhouse gas, but it is not typically emitted by vehicles.

Global Warming refers to the long-term increase in Earth's average surface temperature due to the accumulation of greenhouse gases.

Particulate Matter (PM) is not specifically regulated by the Clean Air Act, although it is a component of some regulated pollutants, such as PM2.5 and PM10.

Emission Control is the general term used to describe the process of reducing or eliminating pollutants from vehicle exhaust.

Exhaust Gas Recirculation (EGR) is not an emission control technology used in vehicles. It is a technique used to reduce nitrogen oxide (NOx) emissions by recirculating a portion of the exhaust gas back into the engine.

The oxygen sensor measures the amount of oxygen in the exhaust gas to determine if the air-fuel mixture is too rich or too lean.

Hybrid is not a type of alternative fuel. It refers to vehicles that use a combination of an internal combustion engine and an electric motor.

Retrofitting refers to the process of modifying a conventional vehicle to run on an alternative fuel.

Increased vehicle performance is not typically a benefit of using alternative fuels.

Transportation Demand Management (TDM) refers to strategies aimed at reducing vehicle emissions by managing traffic demand and promoting alternative transportation options.

Fuel Economy Standards are not a type of vehicle emission standard. They are regulations that set minimum fuel efficiency requirements for vehicles.

Life Cycle Assessment (LCA) is a technique used to assess the environmental impacts of a product or system throughout its entire life cycle, from raw material extraction to disposal.

The Geneva Convention is not an international agreement aimed at reducing vehicle emissions and improving air quality.