Milwaukee drivers like Caroline and mechanic Chevy report frustrations finding open emissions testing locations as lawmakers push to roll back the mandate.

For millions of Americans, regular emissions tests — sometimes called smog tests — are part of vehicle ownership. Thirty-one states and the District of Columbia have at least one county that requires ...

In the letter "Emissions tests have outlived their usefulness" (Nov. 18) Sal Geraci tries to make the point that because so few cars fail the test, it is worthless to have the test. He states the ...