Sentences with phrase «air concentrations»

At left, the composite annual mean organic aerosol surface air concentrations of the models, defined as the median of the model fields on a 5 ° × 5 ° grid.

Free - air concentration enrichment demonstrates enhanced yield of approximately half of what was projected by enclosure studies — which have as of yet (2006) to be incorporated into the models.

They found thousands of places with air concentrations significantly above the 2 parts per million background level typically found in cities, with some areas as high as 100 ppm.

The simplest test compared modeled and measured BC air concentrations.

Some paint - related activities can dramatically increase indoor air concentrations of VOCs.

To infer the atmospheric record of GEM from firn air concentrations presented in Fig. 1, we determined a site specific, diffusivity - depth relationship.

The models» composite annual mean OA surface air concentrations exceed 0.5 microgram of carbon per cubic meter across most continental regions, as shown at the left of Fig. 3, with maximum concentrations primarily over biomass burning regions and secondarily over industrialized areas.

These include simulating actual product use and measuring emission levels to calculate air concentrations to represent what a person will actually breathe.

«Except for inhalation exposures that may have occurred on 9/11 and a few days afterwards, the ambient air concentration data suggest that persons in the general population were unlikely to suffer short - term or long - term adverse health effects caused by inhalation exposures,» EPA scientists wrote in their analysis published in 2007 [pdf].

However, the agency is less concerned about outdoor air concentrations than it is about the risks to water - dwelling creatures, an EPA spokesperson said in an email.

A study of stomatal frequency in fossil leaves from Holocene lake deposits in Denmark, showing that 9400 years ago CO2 atmospheric level was 333 ppmv, and 9600 years ago 348 ppmv, falsify the concept of stabilized and low CO2 air concentration until the advent of industrial revolution [13].

The first results from the field station, known as the Soybean Free Air Concentration Enrichment — SoyFACE for short — were jarring.

The team used a global network of 500 stations that record carbon dioxide and air concentrations near ground level and in forest canopies to determine how much carbon dioxide absorption occurs in each ecosystem studied.

However there are limited long - term air concentration datasets and significant gaps in the spatial and temporal coverage (Keeler et al., 2009).

Indoor air concentrations in University of Iowa labs and offices were 30 and 75 times higher than those in the outdoor air of Cedar Rapids and West Branch, and D5 made up 97 percent of mass of the indoor samples.

We used a one - dimension gas diffusion model in Eulerian coordinates developed by Rommelaere et al. (24) to infer the atmospheric record of GEM from firn air concentrations (Fig. 1).

In fact, air concentrations of carbon dioxide have to build up to more than 10 percent to be hazardous, which is difficult to achieve, according to modeling at Lawrence Livermore National Laboratory.

In fact, air concentrations of carbon dioxide have to build up to more than 10 percent to be hazardous, which is difficult to achieve, according to modeling from Lawrence Livermore National Laboratory (LLNL).

Postdoctoral fellow Therese Haugdahl Nøst has reported the air concentrations for environmental pollutants in Chittagong, and the results show hazardous levels.

A Japanese study estimated DBP exposure to by 20 % -30 % of the dietary intake, with maximum daily exposure from indoor air concentrations to be about 136 kg / day.

These are air concentrations, not snow / ice deposit concentrations.

Thus, evaluation of all physical and chemical processes that may affect GEM between the shallow snowpack and the deep firn is required to correctly infer an atmospheric history from firn air concentrations (reported in Fig. 1).