Timetable for Selected Mobile Source Provisions of the
1990 Clean Air Act
- Limits on maximum gasoline vapor
pressure became law nationwide.
- Regulations setting minimum oxygen
content for gasoline took effect in areas where carbon monoxide levels
exceed national pollution standards.
- Production of vehicles requiring leaded
gasoline became illegal.
- New standards for sulfur content of
diesel fuel took effect, reducing the maximum sulfur level by 80
- Phase-in of tighter tailpipe standards
for light-duty vehicles begins.
- Enhanced Inspection and Maintenance
programs begin in some polluted cities.
- Phase-in of cold temperature carbon
monoxide standards for light-duty vehicles begins.
- Trucks and buses must meet stringent
diesel particulate emission standards.
- New cars must be equipped with onboard
- Reformulated gasoline provisions take
effect in the nation's smoggiest cities and in other areas that
voluntarily join the program.
- New warranty provisions on emission
control systems take effect.
- Phase-in of California Clean Fuels pilot
- Lead banned from use in motor vehicle
- All new vehicles (1996 model year cars
and light trucks) must meet new tailpipe and cold-temperature carbon
- Clean-fuel fleet programs begin in ozone
and carbon monoxide non-attainment areas in 19 states.
- Second phase of the Fleets and
California Pilot clean fuels programs begin.