The bus emits much less hydrocarbons, nitrous oxides and particulate matter than diesels, Fletcher said.
By the time a car achieves Euro V standards, emissions of NOx and particulate matter are negligible.
Others are expected soon that will tighten caps on toxic metals like mercury, acid gases and particulate matter.
The conference will mainly focus on colloidal and particulate matter in water technology.
That dominance is threatened by tightening emissions regulations governing nitrogen oxides and particulate matter--emissions that plague diesel engines in particular.
Most of these deaths occur in developing countries where larger amounts of harmful chemical compounds such as toxic gases and particulate matter are released in the atmosphere.
Especially when the pollutants include ozone and particulate matter.
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Using gas cookers, or burning candles, for example, both result in indoor levels of carbon monoxide and particulate matter that are just as high as those to be found outside, amid heavy traffic.
It aims to establish a platform for exchange of knowledge with respect to methods for characterisation of colloidal and particulate matter in these systems and to cover the technological aspects of particulate matter in different water treatment processes such as drinking water, wastewater and landfill polluted waters.
Three main topics will be tackled, namely removal of particulate and colloidal matter within drinking water production and in wastewater treatment, and reduction of colloidal carriers mobilised from waste disposals.
The report also says that the congestion charge has caused reductions in the two most concerning pollutants to London, by 8% for nitrogen oxides and 7% for particulate matter that is fine enough to penetrate the lungs and cause health problems (referred to as PM10).
Unlike particulate matter and smog-forming chemicals, carbon dioxide can't be filtered or trapped.
The EPA, along with individual states, now regulates pollutants like hydrocarbons, particulate matter and nitrous oxides that are produced by cars and trucks.
Unlike hybrids, even newer diesels run afoul of emissions laws because they produce more particulate matter and smog-forming nitrous oxide than gasoline engines.
With engines switched off, approximately 1, 000 pounds of nitrogen oxides emissions, 165 pounds of sulfur oxides, and 30 pounds of particulate matter are eliminated in a 24-hour port call.
Sulfur dioxide produces fine particulate matter and acid rain.
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Public hybrid buses have been tested in New York to some success, according to the EDTA, which says the buses emit 90 percent less particulate matter and 30 percent fewer greenhouse gases than regular diesel buses.
The correlation between particulate matter and these health issues is particularly pronounced in children, as well as low-income communities, which are often located closer to the sources of particulate matter (highways, factories, power plants) than their higher income neighbors.
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The latter include health-damaging and smog-forming airborne pollutants like hydrocarbons, nitrogen oxide, particulate matter, carbon monoxide and formaldehyde, as well as greenhouse gases that contribute to climate change, like carbon dioxide, nitrous oxide, methane and other compounds.
They promise lower emissions of nitrogen oxides, sulfur oxides, particulate matter, and carbon dioxide (CO2).
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This will allow truckers to reduce emissions significantly (diesel emissions include nitrous oxides, particulate matter, and other air toxics and they are a major source of pollution in some areas).
Natural gas power emits merely 20% of the carbon monoxide of coal power, 20% of the nitrogen oxides of coal power, less than 1% of the sulfur dioxide of coal power, less than 1% of the particulate matter of coal power and less than 1% of the mercury of coal power.
The study compared mice fed a high-fat diet with those fed a normal, healthy diet, and exposed some members of both groups daily to fine particulate matter, controlling for all other factors.
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Medical research has long supported the fact that exposure to fine particulate matter increases the risk of various respiratory, cardiovascular, and pulmonary illnesses.
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Incidences of asthma, heart attacks, and chronic bronchitis are all higher in areas where the concentration of fine particulate matter is higher.
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Respiratory health researches have for years suspected a relationship between raised levels of particulate matter (defined as airborne particles smaller than 2.5 micrograms) and cardiac arrest.
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