Pre-2013 model-year engines without OBDs will be required to submit an opacity test and a visual/functional inspection twice a year. The opacity test must be up to the SAE J-1667 opacity standard.

A truck undergoes a Periodic Smoke Inspection Program opacity test in Buellton, Calif. (Beryl Technologies via Twitter) Also, CARB randomly audits fleets, reviews on-site maintenance and ...

But again, the new date for submitting opacity test has been extended until March 31, 2008. The acceptable opacity standards are equivalent to those the provincial AirCare On-Road Program: 55 percent ...

One thing that can show on a CT scan or X-ray is a degree of haziness referred to as opacity. This can indicate ... and phrases related to this imaging test can be complicated and hard to understand.

Take a look to see how opacity, viscosity, and specific gravity are all examined to deliver premium quality. The first test evaluates the opacity of the paint. Here, paint is applied to chart ...