More than a hundred people made their way through the line for the free emissions test.
If their car didn't pass, drivers were given a voucher for up to $500 dollars to get their cars repaired.
Organizers say they were met with some very enthusiastic people.
"We don't encourage anyone to camp overnight but they took it upon themselves. One lady got here at 2pm yesterday, Friday, to camp out and wait for the services. So the lady was obviously in line, car number one," Jose Marin of Valley Clean Air Now said.
There are ways you can help keep the air clean.
Valley Clean Air Now advises drivers to get their cars checked out every 75-hundred miles, keep air filters clean and keep tires properly inflated.