Sentences with phrase «as a pollutant when»

Not exact matches

Ground - level ozone is a secondary pollutant, meaning that it is not emitted directly, but forms when sunlight triggers reactions between natural and human - caused chemical emissions, known as ozone precursor gases.

Frank Gilliland, an environmental epidemiologist at the University of Southern California in Los Angeles, became intrigued when laboratory studies suggested that certain pollutants in the environment might function as «obesogens,» contributing to weight gain by mimicking or disrupting the action of hormones, or having other effects.

Most car - detailing services continue to employ environmentally harmful products such as ammonia, volatile organic compounds and other chemical - based treatments that off - gas harsh pollutants inside the car as well as harm waterways when they are washed down storm drains

There are inherent dangers when it comes to tampering with natural processes, however, and Prather said that what could be seeded into a cloud one day to increase precipitation could fall down to the ground later as a pollutant.

Natural gas is often touted as more sustainable than coal and oil because it releases fewer pollutants when it burns.

20 Snow is near - pure crystallized water, but when it collects on the ground it acts as a reservoir for atmospheric pollutants such as mercury and soot.

Pfister and a nationwide scientific team expect to learn more about the sources, chemistry, and movement of air pollutants this summer when they launch a major field experiment known as FRAPPÉ along Colorado's Front Range.

Lately, as envirogenomics has taken off, scientists have begun to test for genetic markers in humans who are most heavily exposed to pollutants, an effort that got a huge boost in 2006 when Congress approved the $ 40 million Genes, Environment, and Health Initiative, a program administered by the National Institutes of Health (NIH).

This odorless pollutant is usually formed as a byproduct when chlorine is used to disinfect drinking water.

The nucleases were capable of pushing out an undesirable trait in a plant — such as a gene for a chemical that acted as an environmental pollutant when consumed by livestock — and replacing it with a desirable trait, such as herbicide resistance, in a single shot.

Sometimes, when an air pollutant, such as sulfuric acid combines with the water droplets that make up clouds, the water droplets become acidic, forming acid rain.

So when it comes to foods, I think of those endocrine disruptors as well but I think the persistent organic pollutants are where we have the best data but I think it extends far beyond just the pops.

When you bathe in water as hot as you can tolerate, pollutants and chemicals picked up throughout the day are drawn to the surface of the skin.

I think that there is some case history in the pollution field, actually: when multiple sources produce a particular pollutant that has been fingered as «at cause» in a sickness or mortality incident, the blame gets apportioned between the sources as some function of their contribution to the exposure.

On the other hand, there are many > hundreds, if not thousands, of publications by dendrochronologists > implicitly claiming that they do understand the biology of wood formation, > as they have used their data to imagine when past regimes of water, > temperature, pollutants, CO2, soil nutrients, and so forth existed.

When EPA announced it was planning to regulate carbon dioxide as a pollutant, we filed briefs and an 880 - page report, Climate Change Reconsidered, proving the science was illegally unsound by being based only on the UN's IPCC reports, which we have effectively rebutted.

When it comes down to it, of course, that's all carbon dioxide is: a pollutant, at least so far as the EPA is concerned.

Even when they tweaked that question to clarify what the regulations are, and to emphasize that they come at a cost to electricity prices, Americans continue to express support for the idea of allowing the government to «regulate carbon dioxide, the primary greenhouse gas, as a pollutant» at a roughly 2 to 1 ratio.

Natural gas is often advertised as a more sustainable energy source than coal, given that it releases fewer pollutants when it burns.

When an air pollutant is identified as endangering public health or welfare, that's an «endangerment finding.»

To be sure some toxins are seen as pollutants to like cyanide in gold mine holding pond when it leaches in large volumes into the groundwater.

During extreme heat events, nighttime temperatures in the region's big cities are generally several degrees higher28 than surrounding regions, leading to increased heat - related death among those less able to recover from the heat of the day.36 Since the hottest days in the Northeast are often associated with high concentrations of ground - level ozone and other pollutants, 37 the combination of heat stress and poor air quality can pose a major health risk to vulnerable groups: young children, the elderly, and those with pre-existing health conditions including asthma.29 Vulnerability is further increased as key infrastructure, including electricity for potentially life - saving air conditioning, is more likely to fail precisely when it is most needed — when demand exceeds available supply.

The EPA estimates that the new rule would cut traditional air pollutants such as sulfur dioxide, nitrogen oxides and soot by 25 percent, according to those who have been briefed, yielding a public health benefit of between $ 55 billion to $ 93 billion when it is fully implemented with 2,700 to 6600 premature deaths avoided and 140,000 to 150,000 asthma attacks a year avoided.

Acid rain develops when compounds like sulfur dioxide and nitrogen oxides released into the atmosphere combine with water and oxygen to form acidic pollutants such as sulfuric acid (EPA, 2012).

This is a more plausible representation of a world with future climate policy than assuming a more business - as - usual scenario for these other pollutants — as has often been done when calculating budgets in the past.

However, when nitrogen oxides are present in high concentrations as a result of human - caused pollution, VOCs react with these pollutants to produce more ozone and methane.

• Won a key 2007 victory on greenhouse gas vehicle emissions when the nation's highest court sided with our coalition and struck down the Environmental Protection Agency's refusal to regulate carbon dioxide as a pollutant under the Clean Air Act.

«A common understanding of a pollutant is a substance that «pollutes» or renders impure a previously unpolluted object, as when chemical wastes leach into a clean water supply.»

Debris and mineral buildup in pipes Debris — such as sand, dirt, and pollutants — can enter your home's pipes when a water main fractures.