Sentences with phrase «lower ozone levels»

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

Ozone seemed to stunt the trees: Saplings in rural areas, where there was less pollution but more ozone, were smaller than urban trees, which experienced dirtier air and lower ozone levels.

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.

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.

Ozone measurements from the first week of March already show a region over the North Atlantic with very low ozone levels (< 250 Dobson units, versus minimum values of ~ 300 in the early 1980s).

Ozone measurements from the first week of March already show a region over the North Atlantic with very low ozone levels (< 250 Dobson units, versus minimum values of ~ 300 in the early 1980s).

We've expressed puzzlement that the agency wants to impose more stringent standards when the existing ones are working — lowering ozone levels 18 percent between 2000 and 2013 according to EPA's own data.

Not exact matches

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

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

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.

Under the U.S. Clean Air Act, low - level ozone is a listed pollutant.

The most recent research, which covers 1989 to 1992, and correlates tree sickness with low - level ozone pollution (This Week, 18 June 1994), is due to be published soon.

Earth System Threshold Measure Boundary Current Level Preindustrial Climate Change CO2 Concentration 350 ppm 387 ppm 280 ppm Biodiversity Loss Extinction Rate 10 pm > 100 pm * 0.1 - one pm Nitrogen Cycle N2 Tonnage 35 mmt ** 121 mmt 0 Phosphorous Cycle Level in Ocean 11 mmt 8.5 - 9.5 mmt — 1 mmt Ozone Layer O3 Concentration 276 DU # 283 DU 290 DU Ocean Acidification Aragonite ^ ^ Levels 2.75 2.90 3.44 Freshwater Usage Consumption 4,000 km3 ^ 2,600 km3 415 km3 Land Use Change Cropland Conversion 15 km3 11.7 km3 Low Aerosols Soot Concentration TBD TBD TBD Chemical Pollution TBD TBD TBD TBD * pm = per million ** mmt = millions of metric tons #DU = dobson unit ^ km3 = cubic kilometers ^ ^ Aragonite is a form of calcium carbonate.

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.»

Similarly, if the level of ozone could be lowered by just 1 part per billion (ppb) nationwide, about 1,900 lives would be saved each year.

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.

A final possibility is that there has been increased formation of the hydroxyl radical in the atmosphere — perhaps caused by the thinning of the ozone layer, which allows more ultraviolet radiation to reach low levels.

«Higher ozone, lower humidity levels associated with dry eye disease.»

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.

Detailed analysis of data from the World Meteorological Organization has confirmed record low levels of ozone in the northern hemisphere.

The ozone level was 12 per cent below normal, lower than at any time in the 35 years of continuous monitoring.

As the satellite orbits the Earth the star appears lower in the horizon, and ozone levels can be measured at any altitude, in 30 - metre slices.

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.

But the researchers, led by AWI atmospheric scientist Markus Rex, found levels in the west Pacific below 10 ozone particles per billion — so low their instruments couldn't even get a precise count.

Potential study limitations include being geographically confined to Baltimore and the decision to not measure indoor ozone levels because previous studies found those levels to be low indoors in the city.

While the ozone hole is a stratospheric phenomenon, it can also stir winds in the lower levels of the atmosphere, which in turn affect Antarctic sea ice.

«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.

While the ozone hole is a stratospheric phenomenon, it can also stir winds in the lower levels of the atmosphere, which in turn affect

In summer, southerly transport associated with clean maritime air masses and cloudy weather leads to relatively low surface ozone levels, often resulting in the annual minimum (Wang et al., 2009; Lam et al., 2001).

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.

Earth's much thicker layer of low - level ozone, however, has a much larger contribution from the build - up of molecular oxygen beginning some 2.4 billion years ago from photosynthetic microbes excreting oxygen as a waste gas, which now along with plant life is constantly replenishing Earth's two - atom as well as three - stom ozone oxygen molecules.

Possible reasons include increased oceanic circulation leading to increased subduction of heat into the ocean, higher than normal levels of stratospheric aerosols due to volcanoes during the past decade, incorrect ozone levels used as input to the models, lower than expected solar output during the last few years, or poorly modeled cloud feedback effects.

Another good example is O2 (oxygen, vital for life) and O3 (ozone, toxic even at low levels).

some Freon ito that tank, the ozone Level will drop and stay low.

As William points out, ozone depletion is levelling out since the Montreal Protocol, and so lower stratospheric cooling will start to attenuate, but then Milloy doesn't appear to think that ozone depletion was a real phenomena either.

The bulk of the ozone is at lower levels and is not affected by the processes decribed by Randall et al..

The electron belt is on top of the proton belt, the so called van Allen belts, then there is the upper ionosphere which tends negative and the lower ionosphere that tends positive, and this coupling impact, and space particles attracted to opposing sings and a dance of high energy particles that come with O2 splitting and ozone level increases, namely toward the tropics, while the closing isobars bring particles to the poles... all mean that flaring has a HUGE electrical meaning.

With such facts, it's worth to note that the proclaimed impending Maunder Minimum, although having little effect on AGW, will have a positive effect on the ozone hole: if the lower level sun activity is confined to essencialy UV spectrum, then ozone will be depleting at lower rate, giving it a chance to recover quicker.

In 1990 CO2 accounted for more than 98 % by weight of the total emissions of the five main GHGs (low - level ozone is not considered here or elsewhere in this sheet because its impacts, although large, are still difficult to quantify).

The gases responsible for creating low - level ozone are carbon monoxide, the oxides of nitrogen (all found in car exhaust fumes), methane, and other hydrocarbons.

The British Antarctic survey team determined in the early 1980s that ozone levels were lower than measures taken in 1957.

After all, the scientific assessment that the safe level of ozone should be lowered to somewhere between 60 and 70 parts per billion hasn't changed.

Car exhaust is the major source of this ground level ozone which is most dangerous to vegetable life, causing stunted growth and lower agricultural yields.

Environmental groups have been advocating for a lower limit on ground - level ozone since it was initially set at 75 parts per billion under George W. Bush in 2008.

A paragraph from a 2007 United Nations - sponsored report provides a depressing introduction: «In the air, (reactive nitrogen) can contribute to higher levels of ozone in the lower atmosphere, causing respiratory ailments and damaging vegetation.

o they have a high level of certainty that ground level ozone in the future will be higher, lower, or about the same (yes, they actually said that!)

Atmospheric levels of ozone - depleting chemicals have reached their lowest levels since peaking in the 1990s, and the hole has begun to shrink.

Then the ozone at the lower levels below 45Km starts to fall a year later.

Last week, the U.S. Supreme Court upheld an EPA reg on low level ozone (developed under the George W. Bush Administration no less) that Industry had appealed in the Courts for about 6 years:

An example of this is what EPA regs to use on things like future mercury and low level ozone emissions.