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Timetable for Selected Mobile Source Provisions of the
1990 Clean Air Act
1992
- 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.
1993
- 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
percent.
1994
- 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
diagnostic systems.
1995
- 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.
1996
- Phase-in of California Clean Fuels pilot
program begins.
- Lead banned from use in motor vehicle
fuel.
- All new vehicles (1996 model year cars
and light trucks) must meet new tailpipe and cold-temperature carbon
monoxide standards.
1998
- Clean-fuel fleet programs begin in ozone
and carbon monoxide non-attainment areas in 19 states.
2001
- Second phase of the Fleets and
California Pilot clean fuels programs begin.
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