Sentences with phrase «ozone levels from»

Salby told the site Nature.com that the swings in ozone levels from spring to spring result from a weather pattern known as dynamical forcing.

The image was produced using a computer model which estimates ozone levels from actual meteorological data.

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.

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».

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.

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.

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.

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

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.

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).

At high levels, tropospheric ozone can cause respiratory problems from asthma to emphysema.

As chlorine levels continue to dissipate from the atmosphere, Solomon sees no reason why, barring future volcanic eruptions, the ozone hole shouldn't shrink and eventually close permanently by midcentury.

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.

Rising methane levels are slowing the ozone layer's convalescence from chlorofluorocarbons.

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

Elisabetta Pierazzo of the Planetary Science Institute in Tucson, Arizona, and colleagues used a global climate model to study how water vapour and sea salt thrown up from an impact will affect ozone levels for years after the event.

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.

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.

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.

Oil and gas development has long drawn criticism for its environmental effects, which range from road - killed wildlife to unhealthy ozone levels.

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.

In the laboratory, the scientists exposed groups of them to ozone levels ranging from 0 parts per billion (ppb) of ozone to 120 ppb, which is found in some urban areas.

Published March 1 in the journal Atmospheric Chemistry and Physics, the study looked at the sources of smog, also known as ground - level ozone, across a period ranging from the 1980s to today.

The team also looked at other contributors to ground - level ozone, such as global methane from livestock and wildfires.

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).

The researchers estimate that cutting those 14 together could avoid between 700,000 and 4.7 million premature deaths (largely from smoky, unhealthy air) and increase crop yields by between 30 million and 135 million metric tons (due to concomitant reductions in ground - level ozone, otherwise known as smog, which forms from fugitive methane and blights crops in Brazil, China, India, the U.S. and elsewhere).

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

Ground - level ozone, which is distinct from the ozone in the upper atmosphere that protects the planet from ultraviolet radiation, is harmful to human health, exacerbating asthma attacks and causing difficulty breathing.

A Northwestern University study by an economist and a chemist reports that when fuel prices drove residents of São Paulo, Brazil, to mostly switch from ethanol to gasoline in their flexible - fuel vehicles, local ozone levels dropped 20 percent.

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.

According to data from the U.S. Environmental Protection Agency (EPA), levels of all major air pollution contaminants (ozone, nitrogen oxides, carbon monoxide, sulfur dioxide, particulate matter and lead) are down significantly since 1970; carbon monoxide levels alone dropped by more than 70 percent.

In fact, 90 percent of the time, ozone levels would range from 27 to 55 ppb.

The convection from such storms deliver ozone from the stratosphere down closer to ground level

IMAGES BELOW show a plume of elevated ozone levels stretching from Africa to Australia.

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.

European mean ground ozone levels are declining, not rising as could be expected from a possible warming trend.

Consistency for surface ozone levels was more difficult to achieve due to the influence of emissions from up - wind regions.

The hole in the ozone layer over the Antarctic has expanded to near - record levels, scientists from NASA and the National Oceanic and Atmospheric Administration (NOAA) said Thursday.

The hole in the ozone layer over Antarctica has expanded to near - record levels, scientists from NASA and the National Oceanic and Atmospheric Administration (NOAA) said Thursday.

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 19Ozone 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 19ozone levels (< 250 Dobson units, versus minimum values of ~ 300 in the early 1980s).

Technically, the Environmental Protection Agency is reducing the National Ambient Air Quality Standards (NAAQS) for ground - level ozone limits from the current level of 75 parts per billion (ppb) down to 70 ppb.

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.

If ozone doesn't return to normal levels, the risk of developing skin cancer and cataracts increases from the increased levels of UV radiation that will reach the Earth.

New EPA Rule Limiting Ground - Level Ozone Draws Fire From All Sides.

Early Earth lacked an ozone layer to act as a shield against high - energy solar radiation, but microbes flourished by adapting to or finding other forms of protection from the higher ultraviolet radiation levels.

IPCC [26] projects the following trends, if global warming continue to increase, where only trends assigned very high confidence or high confidence are included: (i) increased malnutrition and consequent disorders, including those related to child growth and development, (ii) increased death, disease and injuries from heat waves, floods, storms, fires and droughts, (iii) increased cardio - respiratory morbidity and mortality associated with ground - level ozone.

Modeling studies caution that warmer days will lead to higher concentrations of ground - level ozone and smog, which cause sickness and death from respiratory and cardiac disease (79).

Tuft's photographs document the effects of high levels of these light spectrums, usually found in places suffering from ozone depletion.

Ozone depletion (at the international level) and acid deposition (domestically, with cap - and - trade from Bush I) are just two examples....

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 19Ozone 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 19ozone levels (< 250 Dobson units, versus minimum values of ~ 300 in the early 1980s).