Sentences with phrase «of high ozone»

The hazy, hot and humid heat waves when everyone wants to run their air conditioners are the periods of high ozone.

Still, because organisms at northern latitudes have evolved in a world of high ozone, «they may be susceptible to even a few percent increase in UV,» Newman says.

Not exact matches

Everything that has happened since then, including the greenhouse effect and the hole in the ozone layer, makes it clear that a future world could not sustain a population of even the present number at a higher level of industrial development without reaching environmental limits.

Simulations that don't include the effect of CH2Cl2 suggest that high - altitude ozone in the Antarctic will return to pre-1980 levels, the concentration measured before CFCs and other ozone - destroying chemicals were recognized as a problem, in 2065.

The ozone layer — a high - altitude expanse of oxygen molecules that protects us from the sun's ultraviolet rays — has been on the mend for the past decade or so.

Because of their size, «it is — almost — impossible to launch an ozone - sonde at higher windspeed than 30 knots,» she writes.

Their work reveals that 60 % of the ozone vanished in a layer from 16 to 22 kilometers high.

Colder temperatures and weaker high - altitude winds may make the arctic polar vortex even more intense in future winters and trigger greater ozone loss, says atmospheric scientist Paul Newman of NASA's Goddard Space Flight Center in Greenbelt, Maryland, although the losses probably won't approach those in Antarctica.

As shown in previous studies, the litter from the polluted site, which had endured high levels of atmospheric nitrogen oxides and ozone, had higher nitrogen content than litter from the clean site.

Those who were exposed to the highest concentrations of ozone were about 20 percent more likely to develop diabetes, even after adjusting for other possible explanations such as diet and exercise levels.

While the reduced depletion was due mostly to higher temperatures on the icy continent, scientists are hopeful that the chemical levels have dropped enough that the result is a shrinkage of the ozone hole each season.

This is important, as a molecule of ozone lost in this region has a far larger impact on climate than a molecule destroyed at higher altitudes by longer - lived gases.»

In this study in Timothy grass, researchers led by environmental health scientist Christine Rogers of the UMass Amherst School of Public Health and Health Sciences (SPHHS) determined the interactive effects of CO2 and ozone at projected higher levels on pollen production and concentrations of a Timothy grass pollen protein that is a major human allergen.

The «cloud» is a three - dimensional representation of where the concentration of ozone is a high 0.14 parts per million.

VOCs, sunlight and nitrogen oxides react to produce high levels of ozone and photochemical smogs.

Zatko and her adviser at the University of Washington in Seattle realized she could join an ongoing research project in Utah that was studying causes of the area's unusually high ozone levels during winter.

And ozone, which forms a beneficial shield against ultraviolet radiation when high in the stratosphere, is an efficient greenhouse gas when it appears at airliner altitudes — as it increasingly does, since it too is a by - product of fossil fuel burning.

Chlorine and bromine have a particularly high ozone - depleting effect when it is very cold for a sufficiently long period of time.

But it can promote the formation of ground - level ozone, which irritates the lungs and at high levels makes it dangerous for people with respiratory problems to be outside.

The Antarctic ozone hole forms and expands during the Southern Hemisphere spring (August and September) because of the high levels of chemically active forms of chlorine and bromine in the stratosphere.

In the high atmosphere, ozone plays a crucial role in shielding the surface from harmful levels of ultraviolet light.

Higher temperatures can also increase the emissions of organic compounds from trees, which can then react in the atmosphere to form ozone and particulate matter.

Higher levels of ozone smog, toxic to the lining of the lungs, will also boost the incidence of respiratory diseases.

Higher levels of ultraviolet radiation penetrating the Earth's dwindling ozone layer may be driving some species of frogs to extinction, according to researchers from Oregon.

Air monitoring by researchers in 2000 found levels of volatile organic compounds — highly reactive ozone precursors such as benzene, known as VOCs — were 10 to 100 times higher than what had previously been estimated.

Normally ozone concentrations in this part of the atmosphere are three to ten times higher.

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 formation of large areas of high pressure in the lower atmosphere both lowers ozone levels, by squeezing the ozone layer above, and may provide the very cold conditions in which ozone destruction is greatest.

Fifty years of auto - emission rules have had an impact, but peak levels of harmful ozone remain high

Dr West added: «In monetary terms, we found that the benefits for avoided deaths from ozone and PM2.5 were roughly $ 137 per ton CO2 at high valuation, and $ 45 at low valuation, of which 31 % are from foreign GHG reductions.

Ozone doesn't just live high in Earth's atmosphere; near the ground, it contributes to smog, and ground - level ozone has gradually increased in most places because of industrial pollution from vehicles and fossil - fuel burOzone doesn't just live high in Earth's atmosphere; near the ground, it contributes to smog, and ground - level ozone has gradually increased in most places because of industrial pollution from vehicles and fossil - fuel burozone has gradually increased in most places because of industrial pollution from vehicles and fossil - fuel burning.

«While our study mainly followed SC infants, we also had the opportunity to assess a small sample of pregnancies that were conceived through ART, and observed a higher impact of air pollution — particularly with regard to ozone exposure.

Species such as birch, tulip and linden release very low levels of VOCs, but others such as black gum, poplar, oak and willow produce a lot, leading to ozone levels that can be eight times higher than those linked to the low - impact trees.

Gary Cohen, president and founder of the Massachusetts - based nonprofit Health Care Without Harm, said in a telephone interview that the risks of climate change to both the health of U.S. citizens and the U.S. health care delivery system is profound, particularly in urban areas, where warming average temperatures are exacerbated by the heat island effect and high concentrations of other air pollution like ozone and particulate matter.

OMPS is a three - part instrument: a nadir mapper that maps ozone, SO2 and aerosols; a nadir profiler that measures the vertical distribution of ozone in the stratosphere; and a limb profiler that measures aerosols in the upper troposphere, stratosphere and mesosphere with high vertical resolution.

He adds: «Scientists have been so concerned about ozone depletion that they haven't really thought about what effect such a high ozone level could have — life on Earth needs a certain amount of UV.»

Pollutants that gather from India and China in the lowlands around the mountains can be boosted as high as 18 kilometers, reaching the stratosphere — the atmospheric layer directly above the troposphere that contains most of Earth's ozone.

THE world's highest - flying spy plane, the Russian M - 55, is about to give European scientists their first close - up view of the thin, stratospheric clouds that destroy ozone.

In this case, they form naturally as ozone — a high - energy oxygen molecule — reacts with carbon chains that have double bonds, forming a compound that has two reactive pairs of electrons.

They also tolerated periods of temperatures up to 41 °C and, separately, high ultraviolet radiation — which might come about from damage to the ozone layer.

This is because warmer temperatures and other changes in the atmosphere related to a changing climate, including higher atmospheric levels of methane, spur chemical reactions that lead to ozone.

The ozone measurements, taken between 2 and 6 miles in altitude (3 - 10 kilometers) over a large part of the eastern Indian Ocean, were as high as 80 parts per billion - levels similar to a polluted day in a U.S. city and several times more than normal.

And it could explain why past studies measured higher than expected levels of ozone - damaging chemicals in the stratosphere, Rex says.

The more ozone they found, they thought, the higher the level of OH, a chemical notoriously difficult to measure directly.

High ozone concentrations typically occur outside of the cities and represent a risk factor for the health of rural population as well as for agricultural production.

«Because of its very short - lived nature, and the unlikely scenario of the emissions sustaining a high growth rate, it's highly unlikely dichloromethane would have a major impact on the ozone layer,» said Liang.

For O3, the design value represents the three - year average of the fourth highest daily 8 - hour maximum ozone concentration.

The reflectance is normalized to one; the relatively high continuum and the presence of water vapor, oxygen, and ozone at visible wavelengths are relevant.

The other three metrics: SOMO35 (representative of mid-high ozone levels), and 3MMDA1 and AVGMDA8 (sensitive to high ozone levels) are summed annually or averaged seasonally.

Ozone was recorded at 160 micrograms per cubic metre, a level considered moderate - to - high on the UK's pollution index and almost twice as high as Aberdeen, which had the UK's worst ozone levels at time of wriOzone was recorded at 160 micrograms per cubic metre, a level considered moderate - to - high on the UK's pollution index and almost twice as high as Aberdeen, which had the UK's worst ozone levels at time of wriozone levels at time of writing.