Editing Vehicle emissions control (section)

{{short description|Study of
reducing the emissions produced by motor vehicles}}
{{Lead too short|date=August 2023}}
'''Vehicle emissions control''' is the study of reducing the [[Exhaust gas|emissions]] produced by [[motor vehicle]]s, especially [[internal combustion engine]]s. The primary emissions studied include hydrocarbons, volatile organic compounds, carbon monoxide, carbon dioxide, nitrogen oxides, particulate matter, and sulfur oxides. Starting in the 1950s and 1960s, various regulatory agencies were formed with a primary focus on studying the vehicle emissions and their effects on human health and the environment. As the worlds understanding of vehicle emissions improved, so did the devices used to mitigate their impacts. The regulatory requirements of the Clean Air Act, which was amended many times, greatly restricted acceptable vehicle emissions. With the restrictions, vehicles started being designed more efficiently by utilizing various emission control systems and devices which became more common in vehicles over time.