The high - mileage D4 direct - injection gasoline engine remains too expensive and emits too
much oxides of nitrogen to meet U.S. emissions regulations.
Not exact matches
This is a matter
of much concern as
nitrogen oxides are greenhouse gases.
The amount
of nitrous
oxide in the atmosphere has quickly increased as well, with about a third
of the total added by human activity —
much of that emitted by
nitrogen - based fertilizers, and half
of that from just three nations: China, the Soviet Union, and the United States.
In fact, however, total emissions
of sulfur dioxide were slightly lower in 1970 (15.8 million tons) than in 1980, and total emissions
of nitrogen oxides were
much lower (3.9 million tons).
And although recognized that there also has been an enormous increase
of nitrogenous
oxides (reactive
nitrogen) in the atmosphere (molecules that can adsorb
much more energy than carbon dioxide) their
much lower concentrations is hardly getting any attention, when global warming is discussed.
According to the Chinese Centre for Disease Control and Prevention, the burning
of coal is responsible for 70 percent
of the emissions
of soot that clouds out the sun in so
much of China; 85 percent
of sulfur dioxide, which causes acid rain and smog; and 67 percent
of nitrogen oxide, a precursor to harmful ground level ozone.
Air pollution is a considerable problem in Serbia,
much of it due to emissions
of CO2, ash, sulphur and
nitrogen oxides from coal - fired power plants and mining operations.
Much of this pollution, in the form
of oxides of sulfur and
nitrogen and particulate matter, is the result
of coal combustion in power plants.
Even with
much decreased numbers, the report says sulfur dioxide and
nitrogen oxide emissions from coal power plants will «continue to take a significant toll on the health and longevity
of millions
of Americans.»
Widespread overuse
of artificial
nitrogen fertilizer, for instance,
much of which is wasted in leaching and runoff, contributes to three - quarters
of total US nitrous
oxide emissions.
Coal Pollution is US» Single - Deadliest Form
of Industrial Air Pollution Even with
much decreased numbers, the report says sulphur dioxide and
nitrogen oxide emissions from coal power plants will «continue to take a significant toll on the health and longevity
of millions
of Americans.»