Sentences with phrase «with air concentrations»

They found thousands of places with air concentrations significantly above the 2 parts per million background level typically found in cities, with some areas as high as 100 ppm.

Not exact matches

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.

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.

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).

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.

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.

One lived in clean, filtered air; the other group was housed in enclosures polluted with air containing fine particulates, at concentrations still within EPA standards.

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.

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

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.

With regard to the air quality in cities with high concentrations of nitrogen oxides, this property of Arabidopsis thaliana plants could contribute significantly to the reduction of NO and thus improve air qualWith regard to the air quality in cities with high concentrations of nitrogen oxides, this property of Arabidopsis thaliana plants could contribute significantly to the reduction of NO and thus improve air qualwith high concentrations of nitrogen oxides, this property of Arabidopsis thaliana plants could contribute significantly to the reduction of NO and thus improve air quality.

New Jersey neighborhoods with a majority of black residents are on average twice as close as other neighborhoods to major industrial sources of air pollution, the researchers found, and more likely to be near busy highways that produce high concentrations of harmful particulate matter.

As for the rest of the book, just like one of the myriad of submarines discussed in its pages, I found myself having to come up for air with monotonous regularity to recharge my batteries of concentration.

Sunbelt cities like Los Angeles, Riverside, Calif., and Houston, with their seemingly endless sunny days, gridlocked urban sprawl and heat - trapping stagnant air masses, contain the highest average concentrations of ozone, according to a 2009 study by University of California, Berkeley scientists.

The air samples will be analysed at the Langley Research Centre, and should reveal significant differences compared with today's atmosphere, with its growing concentrations of greenhouse gases.

Nitrous oxide, for example, does not react with organic tissue and is not a product of organic decomposition, so the concentration in the coffin should be an accurate indication of the concentration in the air when the coffin was sealed.

Metropolitan areas with the large populations and elevated concentrations of one or both air pollutants, they wrote, would realize the biggest improvements in public health by meeting the more protective standards.

Researchers at the University of Gothenburg have now revealed that the concentration of nitrogen in plants» tissue is lower in air with high levels of carbon dioxide, regardless of whether or not the plants» growth is stimulated.

The novel metal oxide semiconductor (MOS) gas sensors and so - called gas - sensitive field - effect sensors, which Schütze has been developing in collaboration with partners in Sweden, Finland and Switzerland, are able to detect air contaminants such as formaldehyde, benzene or xylene at concentrations well below one in a million.

An analysis by a team of North Carolina - based environmental and planning researchers concludes that densely populated regions with compact urban development that discourages commuting by car — widely touted as a way to increase public exercise and reduce harmful automobile emissions — may only slightly lower average regional particulate matter (PM) concentrations in air.

With 18 different scenarios tested, the team calculated a range of peak formation of secondary organic aerosols when typical concentrations of limonene were introduced to ozone - rich environments with a range of air exchange raWith 18 different scenarios tested, the team calculated a range of peak formation of secondary organic aerosols when typical concentrations of limonene were introduced to ozone - rich environments with a range of air exchange rawith a range of air exchange rates.

A design value is the three - year average of pollution concentrations measured at each monitoring location and is used to determine whether a county is in attainment with federal air quality standards.

Current PM2.5 and O3 air pollution concentrations were estimated for each county with a valid design value for 2013 - 2015 (available at https://www.epa.gov/air-trends/air-quality-design-values).

Lead report author Kevin Cromar, PhD, director of the Air Quality Program at the Marron Institute and associate professor of population health and environmental medicine at the NYU School of Medicine, added, «Metropolitan areas and states with large populations and elevated concentrations of one or both air pollutants would realize the biggest improvements in public health by meeting the more protective standards.&raqAir Quality Program at the Marron Institute and associate professor of population health and environmental medicine at the NYU School of Medicine, added, «Metropolitan areas and states with large populations and elevated concentrations of one or both air pollutants would realize the biggest improvements in public health by meeting the more protective standards.&raqair pollutants would realize the biggest improvements in public health by meeting the more protective standards.»

For example, exceedances in PM2.5 concentrations were detected by air quality monitors at three locations in the Central Valley at the beginning of September 2017, with these exceedances coinciding with an outbreak of wildfires.

Measurements from the seabed, the air and from land stations, along with modelling analysis, will provide the link between potential sources of elevated methane concentrations and the reason for variations.

Mythbusters have done a simple experiment with different containers of air subjected to a light source, with one container ordinary air, the other having air plus a higher concentration of CO2, quite high I think, possibly 5 %.

Ambient levels of PM 2 days before submaximal exercise testing were significantly associated with increased ST - segment depression during the test.17 This finding suggests that air pollution exposure conveys a greater susceptibility to myocardial ischemia, as demonstrated in an experimental study of dogs exposed to CAP.175 These results also offer insight regarding the relationship between exposure to PM and the timing of AMI.11 Significant associations were identified between symptom onset and both acute (levels within 2 hours before symptoms) and subacute (previous - day average concentration) exposures to PM2.5.

A Japanese study estimated DBP exposure to by 20 % -30 % of the dietary intake, with maximum daily exposure from indoor air concentrations to be about 136 kg / day.

Even though air cleaners improved upon the overall air quality inside households, they didn't lower air nicotine concentrations and also didn't counter all ill side effects associated with 2nd - hand smoke.

The Environmental Protection Agency has found indoor air can be filled with more pollutants than outdoor air, which can ultimately lead to symptoms of «sick building syndrome»: tiredness, fogginess, and lack of concentration.

The researchers found that due to the confined cabin space, with the worst ventilation conditions, as well as in peak contamination, that the evidence indicates that smoking in cars produces fine particle pollution concentrations which are very rarely found in studies on air quality.

Gas concentrations were determined from differences in CO2 and O2 between entering and exiting air with a fuel - cell — based dual channel O2 analyzer (FC - 2 Oxzilla; Sable Systems International) and two infrared CO2 analyzers (CA - 10 CO2 analyzers; Sable Systems International)(45).

From Peace Lilies to Succulents and everything in between, it's well known that plants can be hugely beneficial to our health, so as part of its Green Up Your Gaff campaign, award winning Perrywood Garden Centre is hoping to boost concentration, improve air quality and reduce stress levels by visiting local schools in the area and providing them with free houseplants.

Note that in most cases, a little kitty pee smell won't harm anyone but, as with anything, if the odor is very strong, extended exposure to the ammonia - laced air can cause not just respiratory distress but can also adversely affect your mood and concentration.

In a 1956 study, small amounts of ammonia in air and water vapour were subjected to dogs to cause vibrant coughs or paroxysms of coughing, with larger amounts of coughing with a higher concentration of ammonia.

A large concentration of museums in the art, photography and history genres can be found at Balboa park with the Air and Space Museum, Museum of Man, Museum of Photographic Arts, San Diego Art Institute to over 16 different museums just in the park alone.

Similarly, in Harry Houdini (there's no escape that I can see)(1994), Wood brings an air of both concentration and resignation to navigating his captivity in a box half - filled with water.

Miller et al (2013) combine measurements of methane concentrations in various locations through time with model reconstructions of wind fields, and «invert» the information to estimate how much methane was released to the air as it blew over the land.

Mythbusters have done a simple experiment with different containers of air subjected to a light source, with one container ordinary air, the other having air plus a higher concentration of CO2, quite high I think, possibly 5 %.

The study notes that «It is not physically possible for large enough volumes of air to interact with the surface under normal atmospheric conditions and therefore this method will not remove sufficient molecules of NO2 to have a significant impact on ambient concentrations.»

The steady - state methane concentration in the air scales nearly linearly with the emission rate.

At 1 % concentration of carbon dioxide CO2 (10,000 parts per million or ppm) and under continuous exposure at that level, such as in an auditorium filled with occupants and poor fresh air ventilation, some occupants are likely to feel drowsy.»

It focused on laboratory tests in which coccolithophores were grown in water made more acidic by infusing it with bubbles of air with elevated concentrations of carbon dioxide.

The analysis concluded that without much stronger action to cut emissions both before and after 2020, «global emissions will remain on an unsustainable pathway that could lead to concentrations equal or above 550 p.p.m. [parts per million of carbon dioxide in the air] with the related temperature» rising 3 degrees Celsius, or 5.4 degrees Fahrenheit.

A statistical forecast using a regression based approach with fall surface air temperature anomalies over the region as the main predictor was submitted by Tivy (Figure 4) for ice concentration anomalies in September.

I also learned that he was one of four co-authors on a peer - reviewed paper about an Exxon supertanker outfitted with equipment to measure carbon dioxide concentrations in the sea and air along its route from the Gulf of Mexico to the Persian Gulf.

please read Z. Jaworowski's (with Segalstad and Ono) many papers on this subject of trapped gases in glaciers, where he discusses the over 20 mechanical and chemical processes that make accurate measurements impossible; even in shallow cores above the point where co2 is supposedly permanently trap in ice cavities in the firn, co2 concentrations are already 20 - 40 % lower than those measured in air at mauna loa.

Most interesting is that the about monthly variations correlate with the lunar phases (peak on full moon) The Helsinki Background measurements 1935 The first background measurements in history; sampling data in vertical profile every 50 - 100m up to 1,5 km; 364 ppm underthe clouds and above Haldane measurements at the Scottish coast 370 ppmCO2 in winds from the sea; 355 ppm in air from the land Wattenberg measurements in the southern Atlantic ocean 1925-1927 310 sampling stations along the latitudes of the southern Atlantic oceans and parts of the northern; measuring all oceanographic data and CO2 in air over the sea; high ocean outgassing crossing the warm water currents north (> ~ 360 ppm) Buchs measurements in the northern Atlantic ocean 1932 - 1936 sampling CO2 over sea surface in northern Atlantic Ocean up to the polar circle (Greenland, Iceland, Spitsbergen, Barents Sea); measuring also high CO2 near Spitsbergen (Spitsbergen current, North Cape current) 364 ppm and CO2 over sea crossing the Atlantic from Kopenhagen to Newyork and back (Brements on a swedish island Lundegards CO2 sampling on swedish island (Kattegatt) in summer from 1920 - 1926; rising CO2 concentration (+7 ppm) in the 20s; ~ 328 ppm yearly average