Which agency is responsible for enforcing emissions standards in Pennsylvania?

The Pennsylvania Department of Environmental Protection (DEP) is the agency tasked with enforcing emissions standards in Pennsylvania. This agency's primary responsibility is to protect the environment and public health by ensuring compliance with environmental laws, which includes monitoring and regulating air quality and vehicle emissions. The DEP establishes and enforces regulations aimed at reducing air pollutants from various sources, including motor vehicles, to meet federal and state air quality standards.

Other options, such as the Pennsylvania Department of Transportation, primarily focus on transportation infrastructure and safety rather than environmental regulation. The Pennsylvania State Police's main role is in law enforcement, and while they may have a role in enforcing certain laws related to vehicles, emissions standards fall outside their jurisdiction. Similarly, the Pennsylvania Bureau of Motor Vehicles is mainly concerned with vehicle registration and driver licensing, not the enforcement of emissions standards. Therefore, the Pennsylvania Department of Environmental Protection is the correct agency with the authority and responsibility for overseeing emissions standards in the state.