During a Smog Check inspection, trained technicians use specialized equipment to measure the emissions produced by a vehicle's engine. Common pollutants tested include nitrogen oxides (NOx), carbon monoxide (CO), hydrocarbons (HC), and particulate matter (PM). If a vehicle's emissions exceed the allowable limits, it may fail the inspection and be required to undergo repairs or upgrades to reduce emissions.

Once a vehicle passes the Smog Check inspection, it receives a certification indicating compliance with emissions standards. This certification is necessary for vehicle registration or renewal, ensuring that only vehicles meeting emissions requirements are allowed on the road.

The program also raises awareness about the importance of vehicle emissions testing and maintenance, encouraging responsible vehicle ownership and contributing to a culture of environmental stewardship.

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