I need to have the smog on my car checked.

smog is a solution because it is the main ingredient in air and pollution combined

No, there will be no problem at the DMV. The important thing is that the DMV has received your vehicle's smog check certificate number and the vehicle has passed. The reason for the smog test is simply for smog check data which is obtained by Sacramento and used for analysis.

The "short" answer is- Inefficient combustion in the vehicle's engine produces chemicals that when exposed to sun-light create smog.

smoke and fog