Sentences with phrase «ozone levels well»

Since a large body of evidence links pollution with poor health, and health is an important part of human capital, efforts to reduce pollution could plausibly be viewed as an investment in human capital and thus a tool for promoting economic growth... We find robust evidence that ozone levels well below federal air quality standards have a significant impact on productivity: a 10 ppb decrease in ozone concentrations increases worker productivity by 4.2 percent.

We find robust evidence that ozone levels well below federal air quality standards have a significant impact on productivity.

Variation in ozone concentrations at ozone levels well below federal air quality standards have a significant impact on productivity.

Not exact matches

Antarctic ozone wouldn't recover to pre-1980 levels until well after the year 2100, the analyses suggest.

As well as human influences, Novelli points out that the eruption of Mount Pinatubo in June 1991 may be responsible for a recent decrease in stratospheric ozone levels.

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.

Some of these substances interact to form ground - level ozone, as well as fine particulate matter.

Scientists at NASA, the National Oceanic and Atmospheric Administration, as well as other international agencies constantly monitor the stratospheric ozone layer and the levels of ozone - depleting chemicals at Earth's surface.

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 effect of solar activity in fall 2003 was strong, but it was limited to levels well above the actual ozone layer.

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.

When ozone exposure decreased by 10 parts per billion — and was at a level well below the federal air quality standard — the workers were 5.5 percent more productive.

This outcome is important to researchers as well as policymakers and regulators, who use exposure metrics to assess how changes in ozone levels affect human health, vegetation, and climate.

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

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

We will now be able to measure and track Sun - induced space weather as well as global climactic trends in ozone levels, aerosols, vegetation, volcanic ash, and Earth reflectivity, all in high resolution; just the kind of data our civilization needs to make informed cultural, political, and scientific decisions that affect our future.

They find that variation in ozone concentrations at levels well below federal air quality standards have a significant impact on productivity.

There is also the increase in ground level ozone, which is not good for plants and other living things.)

Bringing up ground level ozone (a genuine issue with recorded increases in asthma as well) as a red herring feels like special pleading to me.

Moonbats: «Jacobson found that domes of increased carbon dioxide concentrations — discovered to form above cities more than a decade ago — cause local temperature increases that in turn increase the amounts of local air pollutants, raising concentrations of health - damaging ground - level ozone as well as particles in urban air.»

It is well established that solar UV and ozone interact at the poles — changing sea level pressures.

It described trends such as the growing hole in the ozone layer, pollution and depletion of freshwater sources, overfishing, deforestation, plummeting wildlife populations, as well as unsustainable rises in greenhouse gas emissions, global temperatures and human population levels.

But his administration has also vowed to scale back an EPA rule to limit ground - level ozone pollution, as well as an Interior Department rule to protect streams from coal - mining waste.

Leaving aside the generally less well constrained results using the 1901 — 2010 period that started with two anomalously cold decades, none of these show scaling factors for «other anthropogenic» — predominantly aerosol and to a lesser extent ozone, with minor contributions from land use and other factors — that are consistent with unity at a 95 % confidence level.

Based on newer and better chemical transport models than were available for the TAR, the RF from increases in tropospheric ozone is estimated to be +0.35 -LSB--- 0.1, +0.3] W m — 2, with a medium level of scientific understanding.

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).

Scientists like Jackman regularly try to improve their computer models to more accurately simulate the atmosphere, and, in this case, to better determine present ozone levels and to predict future amounts.

A good example is the consensus of chemistry models that projected a slow decline in stratospheric ozone levels in the 1980s, but did not predict the emergence of the Antarctic ozone hole because they all lacked the equations that describe the chemistry that occurs on the surface of ice crystals in cold polar vortex conditions — an «unknown unknown» of the time.

Fracking has been linked to groundwater contamination in Pennsylvania, high ozone levels in Wyoming and to headaches, sore throats and difficulty breathing for people living close to wells in Colorado.