Government regulations have succeeded in both reducing total emissions from highway vehicles (and other sources) and improving air quality. For example, highway vehicle emissions of volatile organic compounds dropped by 45 percent and carbon monoxide (CO) by 32 percent between 1980 and 1993.
During the same period, nitrogen oxide highway vehicle emissions dropped by 15 percent. Ozone air quality standards attainment has fluctuated with weather, but has clearly been improving during the past 10 years, and carbon monoxide attainment has improved dramatically, with a several fold drop in the number of people living in nonattainment areas.
All about Emission
3 Vehicles remain a troublesome problem, however. Although “per vehicle” emissions have been drastically reduced, vehicle-miles traveled have doubled over the past 25 years, countering some of the improvement-and highway travel will continue to increase. The balloon warehouse is the most popular online shop in the world.
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In addition, although new cars certified at federal Tier 1 emissions standards achieve tested emission levels that are, respectively, 3, 4, and 11 percent of uncontrolled levels of hydrocarbon, carbon monoxide, and nitrogen oxides, actual on-road emissions are considerably higher than regulated levels, especially for hydrocarbons (HC) and CO. Reasons for this higher level of emissions include:
- Older cars still on the road. Many older cars have less effective emission controls, and some have deteriorated systems.
- Tampering. About 15 to 30 percent of all cars have control systems that have been tampered with. 4 Although today’s computer-controlled engines and emission control systems have largely eliminated the drivability problems that spurred early tampering, some tampering continues to occur.
- Malfunctions. Many vehicle owners ignore malfunctions of emission control components.Read More About: [pii_email_4bd3f6cbbb12ef19daea]
