Ultrafine particulate matter refers to nanoscale particulate matter, smaller than 0.1 micron (100 nanometers) in size.
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The recirculated air usually passes through high-efficiency particulate (HEPA) filters before delivery into the cabin.
Coal particulate pollution, on the other hand, kills fewer than 13, 000 people per year.
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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.
It's much like smog in Los Angeles, a small particulate dispersed over a large area.
By the time a car achieves Euro V standards, emissions of NOx and particulate matter are negligible.
This is because, in the wacky world of quantum physics, light is wavy as well as particulate.
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.
New particulate traps are fairly effective at filtering out most of the soot.
To provide air monitoring capabilities to third world citizens, CSIRO has developed a tool that measures fine particulate levels.
This interacts with the NOX and SOX to produce the dangerously small particulate pollution that leads to premature deaths.
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 coarse, almost particulate sun was showering in through the window, filling the small antiseptic space with a false radiance.
On the transportation side, we can rely more on diesel fuel, especially in combination with particulate filters that remove soot.
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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.
However, particulate and sulfurous pollution are easier to reduce than CO2, and they are washed out of the atmosphere relatively quickly.
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"Particulate pollution reflect incoming sunlight and make clouds brighter, " said research team-member Dr Paul Halloran from the UK Met Office Hadley Centre.
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Breathing particulate-laden (aka smoggy) air may be hardening your arteries faster than normal, according to research published today in PLOS Medicine.
Corning thinks those filters, which strip particulate emissions out of the exhaust of diesel engines, will soon be its next big hit.
It turns out the filters put on vehicle exhausts to remove fine particulate material have also unbalanced the chemistry behind ozone formation.
These measurements were then correlated with data on fine particulate air pollution.
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.
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