It's true, there is a difference with California legal and Federal legal emission requirements. And, for the most part California is stricter. However, your 1991 Honda Accord (if it has all the Federal required emission components) can pass the California smog inspection process and be legally registered in this state.
As long as your Honda Accord's emissions results fall below California's emissions cutscores for your particular vehicle it will pass the smog inspection.
Click on the link below to look up your Honda Accords California cutscores:
California Emissions Cutscores
