The CARB standards are per-mile. CARB standards for motorcycle total hydrocarbons + NOx are 800mg per km. For light-duty vehicles (cars and trucks and SUVs < 9000 pounds) the standard is 12 mg per mile (no, I do not know why one is in miles and the other is in km). So an SUV that holds maybe as many as 7 people emits much less.
Of all NOx emissions statewide from on-road cars and motorcycles, the motorcycles emit one third of it, despite being only 5% of the fleet and putting on < 1% of the fleet miles.
Of course motorcycles are usually a lot better on CO2.
Of all NOx emissions statewide from on-road cars and motorcycles, the motorcycles emit one third of it, despite being only 5% of the fleet and putting on < 1% of the fleet miles.
Of course motorcycles are usually a lot better on CO2.