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Some of the gases in the atmosphere function like the panes of a greenhouse.
The emission reductions from individual vehicles have not adequately kept pace with the increase in miles driven and the market trend toward more-polluting light trucks, a category that includes sports utility vehicles (SUVs).
As a result, cars and light trucks are still the largest single source of air pollution in most urban areas, accounting for onequarter of emissions of smog-forming pollutants nationwide.
Most of these people own cars and live in large cities.
Beijing, China, is known for having the most polluted air in the world.
These include fuel-efficient vehicles that use less oil; cleaner fuels that produce fewer emissions; and electric cars and trucks that can entirely remove tailpipe emissions. Vehicle emission standards have helped cut pollution from cars and trucks by about 90 percent since 1998, with further improvements coming from the Tier 3 standards.
Future emissions reductions from trucks and other freight sources are essential for meeting air quality standards and protecting the health of those who live and work close to ports, rail yards, and freight corridors.
In 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.
Learn more: Clean vehicle and fuel technologies provide us with an affordable, available means of reducing transportation-related air pollution and climate change emissions.
Air pollution is affecting many people around the world.
The air pollution is hurting our ozone layer allowing the sun’s harmful rays to penetrate more than in the past.