Ultrafine particulate matter refers to nanoscale particulate matter, smaller than 0.1 micron (100 nanometers) in size.
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They promise lower emissions of nitrogen oxides, sulfur oxides, particulate matter, and carbon dioxide (CO2).
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The bus emits much less hydrocarbons, nitrous oxides and particulate matter than diesels, Fletcher said.
In the developed world, the greatest source of particulate matter is from diesel engines.
The diesel engine exhaust doubled the background particulate matter levels found outdoors at its peak.
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.
Unlike particulate matter and smog-forming chemicals, carbon dioxide can't be filtered or trapped.
The environmental tobacco smoke particulate matter reached levels 15 times those measured outdoors.
That dominance is threatened by tightening emissions regulations governing nitrogen oxides and particulate matter--emissions that plague diesel engines in particular.
The new study looked at how much metal this so-called particulate matter is contained in the air of underground train systems.
Meanwhile, trucks account for almost one quarter of China's vehicles but contribute a disproportionate share, almost 80%, of vehicle particulate matter.
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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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.
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.
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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In January, levels of fine particulate matter measured by the U.S. Embassy in Beijing reached a level 35 times the World Health Organization's recommended standard.
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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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.
The government has had some success targeting primary pollutants, but analysts say it is just beginning to target secondary pollutant problems, including particulate matter that is harmful to human health.
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).
Sulfur dioxide produces fine particulate matter and acid rain.
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Especially when the pollutants include ozone and particulate matter.
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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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In addition, it distributed vials containing a steroid that was contaminated with "visible black particulate matter" later identified as fungus, according to a report from the Massachusetts Board of Registration in Pharmacy.
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.
The LEZ covers most of Greater London, and to drive within the LEZ without paying a daily charge, vehicles must meet certain emissions standards that limit the amount of particulate matter coming from their exhausts.
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.
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