Sentences with phrase «ozone levels measured»

Despite a 50 percent cut in smog - forming chemicals such as nitrogen oxides, commonly known as «NOx,» over the past 25 years, ozone levels measured in rural areas of the west have actually climbed.

Not exact matches

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.

Simulations that don't include the effect of CH2Cl2 suggest that high - altitude ozone in the Antarctic will return to pre-1980 levels, the concentration measured before CFCs and other ozone - destroying chemicals were recognized as a problem, in 2065.

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.

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.

They will also measure ozone levels and collect meteorological information.

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.

And it could explain why past studies measured higher than expected levels of ozone - damaging chemicals in the stratosphere, Rex says.

The more ozone they found, they thought, the higher the level of OH, a chemical notoriously difficult to measure directly.

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.

In Utqiagvik, Alaska (formerly known as Barrow)-- one of a handful of stations where NOAA measures Arctic ozone levels — there's been a 12 percent increase in average ozone levels since measurement began 45 years ago, Cooper said.

Cities earn up to two additional points for air quality, as measured by the amount of ground - level ozone and particulate matter its residents are forced to breathe.

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.

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

Although the satellites are considered the gold - standard for measuring and observing sea levels, hurricanes / typhoons, ozone holes, sea ice, atmospheric CO2 distribution, polar ice sheet masses and etc., the same 24/7 technology used to measure temperatures across the entire habitable world is now being ignored (i.e., denied) due to the above inconvenient evidence.

You can measure (theoretically) aerosol levels and ozone.

He presented data of ozone levels over Toronto for a period when I knew there were no such measures; he particularly stressed one very low reading.

This myth arose from a misinterpretation of an out - of - context quotation from a review article (Dobson, 1968), where he mentioned that when springtime ozone levels over Halley Bay were first measured, he was surprised to find that they were about 150 Dobson Units below springtime levels in the Arctic.

This mission is accomplished through long - term observations and intensive field programs that measure total column ozone, ozone vertical profiles (ozonesondes and umkehrs), ground level ozone, and water vapor vertical profiles in the upper troposphere and stratosphere.