Sentences with phrase «ozone levels in»

«Places like the Pacific Northwest and the Minneapolis St. Paul region are cooler and see more rain in the summer, which keeps the ozone levels in check,» said Jerrett.

Confusing the issue, it is also to be expected from reduced ozone levels in the stratosphere.

Fracking has been linked to groundwater contamination in Pennsylvania, high ozone levels in Wyoming and to headaches, sore throats and difficulty breathing for people living close to wells in Colorado.

A good example is the consensus of chemistry models that projected a slow decline in stratospheric ozone levels in the 1980s, but did not predict the emergence of the Antarctic ozone hole because they all lacked the equations that describe the chemistry that occurs on the surface of ice crystals in cold polar vortex conditions — an «unknown unknown» of the time.

This prompts a question: Could the stabilization of ozone levels in the stratosphere help to explain the subsequent «pause?»

Salvo, A and Geiger, F (2014): Reduction in Local Ozone Levels in Urban São Paulo Due to a Shift from Ethanol to Gasoline Use.

Lower ozone levels in the stratosphere may result in more skin cancers, cataracts, and may result in higher incidence of certain diseases.

The possibility that a similar effect might occur in the Northern Hemisphere has been debated, but despite considerable variation in ozone levels in the Arctic, they had not reached the extremes seen in the south.

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A new study has revealed that ozone levels in the heavily populated lower latitudes don't seem to be recovering as well as regions near the poles.

The study — complete details of which have been published in the journal Nature Geoscience — further revealed that the ozone levels in the atmospheric troposphere above China have increased by 7 percent between 2005 and 2010.

Present day (2010 — 2014 average) and 2000 — 2014 trend data were used to estimate ozone levels in 2000.

Louisa Emmons, a visiting scientist at the National Center for Atmospheric Research in Boulder, Colo., and her colleagues connected a region of elevated ozone levels in the eastern Indian Ocean with lightning produced in Africa.

While it has been known for over a decade that Asian pollution contributes to ozone levels in the United States, this study is one of the first to categorize the extent to which rising Asian emissions contribute to U.S. ozone, according to Lin.

In the summer, when these weather patterns subside, ozone levels in national parks are still above what would be expected given U.S. reductions in ozone - precursors.

Press reports last weekend revealed that, locally and for short periods, ozone levels in the upper atmosphere fell during the past month to between 10 and 40 per cent below normal as far south as Shetland.

People living in these regions, and in California's Central Valley, have a 25 to 30 percent greater annual risk of dying from respiratory diseases like pneumonia and chronic obstructive pulmonary disease than do residents who enjoy cleaner air in places like San Francisco and Seattle, where fog, rain and cooler temperatures keep ozone levels in check.

Solomon and her colleagues believed they would get a clearer picture of chlorine's effects by looking earlier in the year, at ozone levels in September, when cold winter temperatures still prevail and the ozone hole is opening up.

For all three regions, the figures for the past two winter - spring seasons are the lowest ever observed, and statistically well below the mean ozone level in these areas.

Not exact matches

And in the United States, about 4 in 10 people live in counties that have unhealthy levels of either ozone or particle pollution, according to the American Lung Association.

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.

Unlike CFCs, pentane does not affect the upper ozone layer, but does contribute to impurities in the lower level of the atmosphere.

I live in Australia, skin cancer capital and right below the hole in the ozone layer, yet I still couldn't get enough vitamin d. No matter what I did, it took pregnancy vitamins + maximum vitamin d to get me to acceptable levels.

Rep. Faso Vote Record Tracking Rep. Faso in the Age of Trump fivethirtyeight.com Ozone Standards Implementation — Vote Passed (229 - 199, 5 Not Voting) The House passed the bill that would extend for eight years the deadline for the EPA to implement new National Ambient Air Quality Standards for ground - level oOzone Standards Implementation — Vote Passed (229 - 199, 5 Not Voting) The House passed the bill that would extend for eight years the deadline for the EPA to implement new National Ambient Air Quality Standards for ground - level ozoneozone.

«To ask the Secretary of State for Transport whether he has requested a derogation from EU air quality legislation in relation to limits on the levels of pollution from (a) nitrogen dioxide, (b) ozone and (c) other nitrogen oxides.

Recent increases in an unregulated ozone - depleting substance, could delay recovery of Antarctic ozone levels by 5 - 30 years, depending on emissions scenarios.

«Ozone recovery may be delayed by unregulated chemicals: Recent increases in an unregulated ozone - depleting substance, could delay recovery of Antarctic ozone levels by 5 - 30 years, depending on emissions scenarios.&rOzone recovery may be delayed by unregulated chemicals: Recent increases in an unregulated ozone - depleting substance, could delay recovery of Antarctic ozone levels by 5 - 30 years, depending on emissions scenarios.&rozone - depleting substance, could delay recovery of Antarctic ozone levels by 5 - 30 years, depending on emissions scenarios.&rozone levels by 5 - 30 years, depending on emissions scenarios.»

Levels of ozone - eating bromine in the lower atmosphere are declining faster than predicted.

Next door, in the «Temporary Atmospheric Watch Observatory,» or «TAWO,» the National Oceanic and Atmospheric Administration tracks the level of greenhouse gases and ozone - depleting chemicals in the atmosphere.

Beyond honing communications skills, participants said while the discussions often started off with broad trends in climate science, invariably the exchanges shifted to specific local issues such as wildfires, ozone levels, crop rotations, sea level rise, droughts and air quality.

Mark Potosnak of DePaul University in Chicago and his colleagues measured terpene emissions from plants on sidewalks in Las Vegas, Nevada, and ozone levels downwind.

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.

Industrial emissions of a chemical commonly used in solvents, paint removers, and the production of pharmaceuticals have doubled in the past few years, researchers have found, which could slow the healing of the ozone layer over Antarctica anywhere between 5 and 30 years — or even longer if levels continue to rise.

If Lu's suggestion is correct, ozone levels should fall then rise every 11 years, in step with changes in cosmic - ray intensity driven by the 11 - year solar cycle.

For while NASA's satellites had been monitoring ozone levels around the world 24/7, Farman had found the hole with an ageing instrument wrapped in a quilt.

People living in parts of southern Europe, South Korea and southern Japan and China also experienced more than 15 days a year of ozone levels above 70 ppb.

Still, arctic ozone levels fell during most winters in the 1990s, making researchers worry that a northern ozone hole might appear.

Although ozone pollution is dropping across many parts of the United States, western Europe and Japan, many people living in those countries still experience more than a dozen days every year in which levels of the lung irritant exceed health - based standards.

And while ozone high in the atmosphere helps shield Earth from the sun's ultraviolet radiation, at ground level, it mixes with fine particulates to form breath - choking smog.

ven so, during 2010 - 2014 people in parts of California, Arizona, Colorado, Texas, the Midwest and the Middle Atlantic still experienced more than 15 days a year in which ozone levels exceeded the U.S. health - based air quality standard of 70 parts per billion (ppb) averaged over eight hours.

«A week ago, the ozone concentration in the stratosphere was still at a normal level; I don't know if it has changed yet.

Although chlorine levels are falling, thanks to agreements that banned chlorofluorocarbons, levels of bromine — which is 45 times more effective at zapping ozone — are still rising, says atmospheric chemist Dale Hurst of the National Oceanic and Atmospheric Administration in Boulder, Colorado.

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.

«It underscores the necessity to control ozone entry into buildings in regions with even moderate ambient ozone levels,» says environmental health scientist Michael Apte of Lawrence Berkeley National Laboratory in California.

Under full compliance with the Montreal Protocol, the ozone layer is expected to recover to 1980 benchmark levels - the time before significant ozone layer depletion - before the middle of the century in mid-latitudes and the Arctic, and somewhat later in the Antarctic.

As is common around the country, New York State's Department of Environmental Conservation routinely monitors the levels of ozone, carbon monoxide, sulfur dioxide, nitrogen oxides, and particulates in the air.

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 allergeIn 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 allergein 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.

If these pheromones are similarly broken down in the presence of ozone and nitrogen oxides, this could also seriously hit population levels.

Atmospheric scientist Maria Zatko was close to completing her thesis on ground - level ozone in 2014 when she learned of a perfect opportunity to fill a gap in her research on this air pollutant.