Sentences with phrase «of ozone levels»

He presented data of ozone levels over Toronto for a period when I knew there were no such measures; he particularly stressed one very low reading.

Jackman says that prior to his study scientists had good measurements of ozone levels during solar storms, but they didn't have as comprehensive a measurement for the effect that protons have on nitrogen oxides (NO and NO2).

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

This video seems to suggest that actually no - one had thought to do a long term plot of ozone levels.

Chemistry - transport model studies of the impact of recent changes of ozone precursor emissions, both regionally and globally as outlined above, consistently show that the local response of ozone levels has been a decrease in North America and Europe and an increase in East Asia (Verstraeten et al., 2015; Zhang et al., 2016; Lin et al., 2017).

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.

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.

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.

State Attorney General Eric Schneiderman said he would sue the EPA over what he said was the agency missing a statutory deadline for designating areas of the country impacted by unhealthy levels of ground - level ozone.

State AG Eric Schneiderman, leading a coalition of 15 state attorneys general, today filed a lawsuit against the EPA and its administrator, Scott Pruitt, for failing to meet the Clean Air Act's statutory deadline for designating areas of the country impacted by unhealthy levels of ground - level ozone (commonly referred to as smog).

«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.

Dr Iarla Kilbane - Dawe from the Department for Transport said: «Ozone was always going to be easy to fix; improving air quality has a whole different level of complexity».

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

Dr Ryan Hossaini of Lancaster University and colleagues use simulations with a global chemical transport model to examine the sensitivity of future stratospheric chlorine and ozone levels to sustained dichloromethane growth.

«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.

Carbon filter technology features ozone power to reduce odors and absorb pollutants to a level of 0.05 ppm.

But if emissions of CH2Cl2 are held to current levels, healing of the ozone hole would be delayed only 5 years or so, the team finds.

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.

City of Dallas Texas Government 334 million green kWh, 40 % of total power used After hosting an eye - opening climate conference, the city government decided to help lower statewide ozone levels by decreasing its conventional power use, says Jill Jordan, an assistant city manager.

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.

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.

Hurst estimates that even with phaseouts of those chemicals, the arctic ozone layer won't recover to its 1980 levels until at least 2050.

The region's levels of ozone and particulate matter, two pollutants caused by both automobiles and industry, exceed national air quality standards.

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.

Average number of days per year (2010 - 2014 average) when ozone levels exceed the US health - based air quality standard of 70 parts per billion (ppb) averaged over eight hours, at non-urban and urban sites.

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.

Mid-1980s: Ozone layer sees a noticeable decline from its average level of about 300 DU.

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.

«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.

Some researchers have pinned the blame on indoor air pollution and a study last year showed that when outdoor ozone levels rose, the number of people inside suffering from so - called «sick building syndrome» also increased.

As levels of ozone, nitrogen dioxide and particulate matter fell over time, so did the number of children who reported a daily cough, persistent congestion and other symptoms of irritated lungs.

These are less reactive, which can have a positive effect on the formation of ground - level ozone.»

Without the Montreal Protocol and associated agreements, atmospheric levels of ozone depleting substances could have increased tenfold by 2050.

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.

According to previous simulations, UV - B radiation at the end of the Permian may have increased from a background level of 10 kilojoules (just above current ambient levels) to as much as 100 kilojoules, due to large concentrations of ozone - damaging halogens spewed from volcanoes (SN: 1/15/11, p. 12).

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 allergen.

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

They found that elevated CO2 of 800 ppm, increased pollen production per flower by 53 percent while the different ozone levels had no effect on the amount of pollen produced.

A consideration of the role of sootlike particulates and ozone implies that the climate should will not be insensitive to increasing levels of greenhouse gases.

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.

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

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.