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Learn how vehicle safety and emissions inspection are regulated by each state in the United States. Find out which states require periodic or one-time inspections, and what types of vehicles are exempt or subject to testing.
Learn about the history and current status of vehicle emission standards in the U.S., which cover tailpipe pollution and fuel economy. Find out how California and other states have different standards and why.
Some states have areas within the state that require emissions testing while other cities within the state do not require emission testing. Arizona emissions testing locations are located primarily in the two largest metropolitan areas (Phoenix and Tucson). People outside of these areas are not required to submit their vehicle for testing as ...
FTP-75 is a city driving cycle that simulates 11.04 miles of urban traffic with frequent stops and a maximum speed of 56.7 mph. It is part of the EPA Federal Test Procedure that also includes highway, aggressive and air conditioning tests to measure tailpipe emissions and fuel economy of passenger cars.
Learn about the history, types, and effects of vehicle emissions control, especially for internal combustion engines. Find out how various regulatory agencies and technologies have reduced the emissions of hydrocarbons, carbon monoxide, nitrogen oxides, and more.
Emissions testing has been federally mandated in northern Ada County since the 1980s, ... On newer cars, the tests rather ensure that the car’s own emissions control systems are working properly.
Learn about the vehicle inspection requirements and processes in different countries and regions. Compare the safety and emissions standards, frequency, and enforcement methods of various jurisdictions.
A portable emissions measurement system (PEMS) is a device that tests vehicle emissions in real-world driving conditions. Learn about the history, applications, and benefits of PEMS, as well as the difference between PEMS and iPEMS.
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