Sentences with phrase «air concentrations of»

Some paint - related activities can dramatically increase indoor air concentrations of VOCs.

At left, the composite annual mean organic aerosol surface air concentrations of the models, defined as the median of the model fields on a 5 ° × 5 ° grid.

In fact, air concentrations of carbon dioxide have to build up to more than 10 percent to be hazardous, which is difficult to achieve, according to modeling from Lawrence Livermore National Laboratory (LLNL).

In fact, air concentrations of carbon dioxide have to build up to more than 10 percent to be hazardous, which is difficult to achieve, according to modeling at Lawrence Livermore National Laboratory.

Not exact matches

It also has the greatest concentration of international banks in the U.S., and it's been called «America's Cleanest City» for its air and water quality, green spaces, and clean streets.

Founded by Cody Friesen, a materials scientist, the startup's Source system relies on an ultra-absorbent material that collects water at 20,000 times the concentration of the air around it.

Researchers in The Netherlands and the U.K. found office plants improved workers» perceptions of air quality, concentration, workplace satisfaction and productivity.

There appear to be three main reasons for the concentration of religious programs on Sundays: (1) Sunday is the traditional day of Christian worship and therefore seemed most appropriate for Christian broadcasts; (2) Christian broadcasts on the networks were originally conceived as alternatives for those, such as shut - ins, who could not attend regular services at a church; (6)(3) Sunday morning was the period of lowest audience for broadcasters and therefore was the least commercially damaging for stations in fulfilling their FCC obligations by providing free air - time for religious broadcasts.

Then there's the issue that aside from Smalling, who himself is prone to lapses in concentration like yesterday's, none of their central defenders are particularly dominant in the air.

He is an excellent shot stopper, good in the air (where he wins over Randolph for me) but liable to the occasional blooper or lapse of concentration; nor does his confidence in his own ball dribbling and juggling abilities stand up to scrutiny.

Chemist and indoor air quality expert Charles J. Weschler, adjunct professor in environmental and occupational medicine at Rutgers University, said he does not think the levels of chemical concentration found in the mattresses are alarming, but he considers the research valuable.

Without the dispersant injection, the model showed that benzene concentrations in the air 2 meters above the sea surface would have been 13 times higher than the levels considered acceptable to breathe during a 10 - hour working day or a 40 - hour work week, based on guidelines by the National Institute of Occupational Safety and Health (NIOSH).

The atmospheric concentration of benzene, for example, decreased by about 6,000 times, dramatically improving air quality.

In addition to the isotope concentration, the air bubbles trapped in the ice cores allow for measurement of the atmospheric concentrations of trace gases, including greenhouse gases carbon dioxide, methane, and nitrous oxide.

The impact of rapid increases in air pollutants on heart health may be at least as important as absolute concentrations.»

There is longstanding evidence that exposure to high concentrations of air pollution increases the risk for several diseases including heart attacks and European Union (EU) statutory pollution limits are based on absolute upper values.

Concentrations of air pollutants one, two, and three days before heart attack symptoms were compared to concentrations in the previous and fConcentrations of air pollutants one, two, and three days before heart attack symptoms were compared to concentrations in the previous and fconcentrations in the previous and following week.

To see if these regulations affected bromine concentrations, atmospheric chemist Stephen Montzka of the National Oceanic and Atmospheric Administration in Boulder, Colorado, and colleagues analyzed air samples taken several times each month from 10 land - based sites across the globe between 1995 and 2002.

The study was conducted in Jena, Germany, a city with 100,000 residents and only a few days over the last several years during which concentrations of some air pollutants exceeded EU daily limits.

It also looked at whether an association between heart attacks and changes in air pollution exists in clean air cities where concentrations of air pollution vary but do not exceed EU limits.

The concentration of atoms in an intergalactic nebula is fantastically low even compared with the thin air of Mars, but sound can exist there too, provided something can spark a big enough acoustic wave.

The new study also found that snow takes up airborne particulate matter and alters the concentrations of different nanoparticles, the smallest particles found in air pollution.

Growth rates for concentrations of carbon dioxide have been faster in the past 10 years than over any 10 - year period since continuous atmospheric monitoring began in the 1950s, with concentrations now roughly 35 percent above preindustrial levels (which can be determined from air bubbles trapped in ice cores).

He is part of a team cataloging the microbial diversity of U.S. air — in which the scientists have picked up, among other things, very small concentrations of bacteria related to anthrax.

New research shows that hotter weather coupled with higher concentrations of carbon dioxide in the air prompt flowering plants to produce pollen that is far more noxious than pollen of the past.

Snow takes up airborne particulate matter and alters the concentrations of different nanoparticles, the smallest particles found in air pollution.

We realized only later that concentrations of dust in the air were so high that they overwhelmed all the normal defenses of the human respiratory tract, and people inhaled ounces of dust into their trachea or their bronchi.

«These releases could lead to a higher short - term concentration of certain pollutants in the air, soil and surface water bodies where the meltwater runs to,» worries Nazarenko.

Keeping atmospheric concentrations of greenhouse gases below 550 ppm, let alone going back to 350 ppm or below, will not only require a massive shift in human society — from industry to diet — but also, most likely, new technologies, such as capturing CO2 directly from the air.

«And we've shown that there are a number of times where the nitrogen dioxide (NO2) concentrations exceed the EU hourly mean limits for outdoor air quality.»

Since the pollution concentration decreases from west to east, as the distance from Los Angeles increases, the forests offered a rare opportunity to compare emissions from wildland fuels subjected to different levels of chronic air pollution.

In another study by Hites, two new flame retardants — one of them sold as Firemaster 550 — were detected in more than half of the air samples taken at six sites along the shores of the Great Lakes, with the highest concentrations around Chicago and Cleveland.

The separation into two chambers means there are two separate flue gas streams to deal with too: air with a reduced concentration of oxygen is discharged from one chamber, water vapour and CO2 from the other.

Average concentrations of two major air pollutants from 2000 to 2012 varied by U.S. region.

Moreover, these measurements were made at concentrations of sulfuric acid and dimethylamine corresponding to atmospheric levels (less than 1 molecule of sulfuric acid per 1 x 1013 molecules of air).

A study published in January in Environmental Health Perspectives reported that daily deaths over a decade in metropolitan Boston peaked on days when concentrations of three common air pollutants were at their highest, even though those levels would currently satisfy the U.S. Environmental Protection Agency.

In a typical urban area with a high level of background air pollution — for example, around 15 micrograms of fine particulate matter (PM2.5) per cubic metre, or a nitrogen dioxide concentration around 33 micrograms per cubic metre — an extra 300 trees per square kilometre was associated with around 50 fewer emergency asthma cases per 100,000 residents over the 15 year study period.

«We found that elevated concentrations of these same chemicals were present at altitudes of 12 km over tropical regions, many thousands of kilometres away from their likely source, and in a region where air is known to be transferred into the stratosphere,» says Oram.

The concentration of carbon dioxide molecules in the atmosphere is measured as parts per million of dry air, or ppm.

Called AmazonFACE (Free - Air Carbon dioxide Enrichment), it's based on a simple idea: For 12 years, researchers will spray pure CO2 into instrumented plots in the rainforest northwest of Manaus, Brazil, raising ambient concentrations to 600 parts per million — a level the world could reach as early as 2050 — all the while taking meticulous measurements to determine how the gas affects the growth of plants.

«Fossil fuel emissions dilute the concentration of heavy CO2 in the air,» said Fleisher.

That hydrogen can then be released from the reactor core and containment vessel and, if it accumulates in sufficient quantities — concentrations of 4 percent or more in the air — it can explode, as has apparently occurred at reactors No. 1 and 3, and possibly No. 2 as well.

They are rather composed of filaments (clusters of odor molecules) of various sizes (> mm) and concentrations interspersed with regions of clean air.

The scheme will dramatically improve living conditions in the city of Decin in northern Bohemia, where the concentration of sulphur dioxide in the air is sometimes ten times the limit set by the WHO.

Concentrations were 10 times higher in Chicago's air than in the air of West Branch, Iowa, and four times higher than in Cedar Rapids, Iowa.

Using mobile monitoring equipment, the researchers measured the air quality, including particulate matter concentration and hydrogen sulfide, of neighborhoods adjacent to hog CAFOs in North Carolina.

The compounds also are probably in high concentrations in the air of many cities, but no one has looked elsewhere yet.

To isolate the effects of oxygen concentration, researchers from the University of Colorado compared the rate of SIDS in infants living at high altitudes, where the air is thin, to those living closer to sea level.

The researchers, led by Sara Adar, John Searle Assistant Professor of Epidemiology, University of Michigan School of Public Health, and Joel Kaufman, Professor of Environmental and Occupational Health Sciences and Medicine, University of Washington, found that higher concentrations of fine particulate air pollution (PM2.5) were linked to a faster thickening of the inner two layers of the common carotid artery, an important blood vessel that provides blood to the head, neck, and brain.

Of the monitoring sites, Davenport had the highest PM2.5 concentration — although within federal air - quality standards — with the highest iron, zinc, and lead concentrations, the data showed.