Hundreds of drivers lined up at the Fresno Fairgrounds today in an effort to clean up our air.
It was part of the San Joaquin Valley Air Pollution Control District's "Tune In and Tune Up" event.
Vehicles underwent emissions tests for free.
Drivers who did not pass were given a voucher worth $500 to be used toward smog repairs.
"I defeinitly know it's going to fail and it's more than i can afford. That's why I came out here to get the voucher," said Romero Hernandez.
More of these events are scheduled to happen in the valley over the next few months.
Cities include: Merced, Porterville, Chowchilla and Hanford. A maximum of 525 vehicles will be tested and it's first come, first serve.