You'll need to do the visual and tailpipe test in California as well, except in California the tailpipe test will also measure NOx if the county your vehicle is registered in is an "Enhanced" smog inspection area.
Currently your Volvo's 2500 RPM emission results would not pass California's smog inspection. HC and CO are too high.
What Causes High HC? What Causes High CO?
The website you want to access in order to find out your Volvo 940 complete and current California emission cut scores is below:
California Emission Cut Scores