Sentences with phrase «on ozone levels»

Despite the EPA claim that Lancaster County PA is among the top ten most polluted counties in the U.S., based solely on the ozone levels (we are a dairy farm area with lots of natural VOC's being converted to ozone) Lancaster County is literally a breath of fresh air.

Note as well that the strength of the vortex itself depends on the temperatures, which in turn depend on the ozone levels.

These can have a limited effect on ozone levels (by serving as hetrogeneous reaction sites) and can reflect enough of the sun's light back into space to cause a notable global cooling.

In addition, he says, since CFCs are not particularly soluble in water, they would not be present in cloud - born ice particles in very high concentrations, so the mechanism Lu and Sanche propose would not dissociate enough CFCs to have a big impact on ozone levels.

Not exact matches

«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.

City Councilman Eric Ulrich (R - Ozone Park) represents the party on the city level.

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.»

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.

Regulations on VOCs vary by state, but most consumer products are regulated only for their potential contribution to ground - level ozone, not fine particulate matter.

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.

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.

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

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.

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.

Its contribution to heating forcing (caused by greenhouse gases, ground - level ozone and «black carbon» [4]-RRB- is 12 % on average.

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.

They then compared their yearly September ozone measurements with model simulations that predict ozone levels based on the amount of chlorine that scientists have estimated to be present in the atmosphere from year to year.

Houston, it turned out, had focused on controlling the wrong emissions from the wrong sources to lower its ozone levels, says Daniel Cohan, an associate professor of environmental engineering at Rice University.

Senator Tom Carper (DE), top Democrat on the panel, cited an interview in which Hartnett White suggested that low - level ozone, an air pollutant, wasn't harmful unless «you put your mouth over the tailpipe of a car for 8 hours every day.»

Despite the continuing evidence of the growing contribution of vehicle pollution to global warming, acid rain and ground level concentrations of ozone, there is scant sign of concerted thinking on what should be done.

This week, without fanfare, it also started tweeting hourly data on ground - level ozone, the prime component of smog.

The glider will carry instruments to measure levels of aerosols and greenhouse gases, including ozone, methane and water vapour, and will gather information on the exchange of gases and energy between the two lower layers of Earth's atmosphere: the troposphere and the stratosphere.

Shown are the 1988 - 2014trends in springtime ozone levels on days that were very smoggy (top panel) and of average smogginess (bottom panel), from observations (left) and from a model built by the Geophysical Fluid Dynamics Laboratory (right).

On very smoggy days (top panel), ozone levels have declined in the east, as indicated by the blue circles.

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.»

Unlike ozone in the stratosphere, which benefits life on Earth by blocking ultraviolet radiation from the Sun, ground - level ozone can trigger a number of health problems.

The report lists 30 cities that face increased health risks from heat waves worsened by global warming, based on a combination of four factors: average number of summer days with «oppressive» summer heat, the percentage of households without central air conditioning, ground - level ozone levels, and the percentage of households below the poverty line.

Also, the researchers referred to the US Environmental Protection Agency's Air Quality System which monitors air pollution levels at different sites across the US, and levels of ozone and fine particulate matter on a given day.

Sheffield, P. E., J. L. Carr, P. L. Kinney, and K. Knowlton, 2011: Modeling of regional climate change effects on ground - level ozone and childhood asthma.

EPA, 2009: Assessment of the Impacts of Global Change on Regional U.S. Air Quality: A Synthesis of Climate Change Impacts on Ground - Level Ozone.

«In some sense, we might have competing effects going on in Antarctica where there is low - level CO2 warming but that may be swamped by the effects of ozone depletion,» he said.

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.

The EPA report is concerned with the impacts that climate change can have on atmospheric chemistry, and in particular the summertime peaks in urban ground - level ozone which are a well - known and serious health hazard.

The Montreal Protocol had no impact on cleaning the air, it stopped the growth of CFCs which are powerful greenhouse gases (in addition to their role in depleting stratospheric ozone), therefore it slowed global warming, rather than increasing it, and we aren't trying to save ground - level ozone.

Photo: «Modeling of regional climate change effects on ground - level ozone and childhood asthma.»

China and South Asia, on the other hand, will see the most ozone - related damage to wheat, rice and soybean crops because of the chronically high levels of toxic air pollution.

And the level of ozone considered here would be typical for a major U.S. city on a hot summer day, notes Fuentes.

Higher levels of carbon dioxide, however, do have an indirect effect on the ozone layer in the stratosphere.

Besides showing pretty views, EPIC provides scientists with metrics on climate such as cloud height, ultraviolet reflectivity, or ozone and aerosol levels.

Rising levels of ozone is a big and growing problem because it weakens a plant's immune system, producing brown spots on leaves.

Federoff's team is studying Arabidopsis to find out which genes are turned on or off by different levels of ozone.

North of Los Angeles, the area also has the second - highest level of ozone pollution in the U.S. Mountains surround the valley on three sides, creating inversion layers that trap pollution, with little wind to carry it away.

The orange level can cause problems in people who are sensitive to ozone (like asthmatics), however, and on red days he recommends that everyone stay indoors to exercise.

O'Connor lives in Philadelphia, which ranks No. 11 on the American Lung Associations list of most polluted U.S. cities in terms of unhealthy levels of ozone.

Shown to be safe in the body on a cellular level, ozone therapy decreases inflammation.

Focusing on the natural world, the Brazilian artist creates works that visualize changes that occur with the passage of time, like erosion, rising sea levels, and the depletion of the ozone layer.

It is true that the Quality Control (QC) flag on the retrieval was set whenever the inferred ozone level dropped below 180 Dobson Units [1 DU is equivalent to a 0.01 mm thick pure ozone layer at standard temperature and pressure].

But what remains is that UVB levels at ground are a function of the total ozone column, and as that column remains very high, there is no need to panic on an hypothetical but inexistant UVB increase.

[Response: Upper atmosphere cooling as a function of increased CO2 occurs at all levels including the mesosphere, implying directly that the mechanism can't rely on the presence if ozone or absorbtion of solar uv.