After more than 38 years, Washingtons emissions testing program for cars and trucks is ending.

When state licensing offices reopen Thursday, residents will no longer be required to obtain an emissions check to renew vehicle registrations. The Washington State Department of Ecology, which oversees the emissions program, indicates advances in vehicle technology and improved motor fuels led to significant reductions in transportation-related air pollution.

“When we began the emission check program back in 1982, air pollution from carbon monoxide and ozone was a serious concern in many of our biggest cities,” Kathy Taylor, manager of Ecology’s air quality program, said in a news release issued Monday. “Today, new cars are much, much cleaner than in decades past, which means we can continue to improve our state’s air quality without these regular tests.”

The Legislature passed a plan in 2005 to phase out vehicle emission testing after adopting more stringent standards for new cars and trucks.

The emissions standards took effect in 2008, exempting vehicles made after 2009 and models older than 25 years. That meant fewer cars were required to get emission checks, and tests declined from a peak of 1.3 million in the mid-2000s to 750,000 in 2018.