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Texas Department of Public Safety
Dep. Of Public Safety: Vehicle Emissions Inspection and Maintenance Manual [Pdf]
A manual for the inspection of vehicles in Texas, to see if they meet the state government standards for emissions and safety. [PDF]
Other
North Central Texas Council of Governments: Current Emission Standards
Outlines Texas emissions standards for light-duty, medium-duty, and heavy-duty vehicles. Includes downloadable reference chart of emissions standards.
Other
Dmv.org: Smog Check and Car Inspection in Texas
A resource site for information on rules and regulations around vehicle safety inspection and emissions testing in Texas. Contains links to forms and requirements, what to do if your vehicle fails a test, and what the inspection and test...