Sentences with phrase «annual average concentrations»

In 2012, the EPA lowered the primary standard for the annual average concentration of PM2.5 particulates considered safe, as more information became known about their prevalence and danger to human health.

At EPA's 23 nitrogen dioxide trend monitoring sites the annual average concentration has gone from 111 micrograms of SO2 per cubic meter in 1980 to only 43.7 in 2016 (61 % reduction).

At EPA's 42 nation - wide SO2 trend monitoring sites the annual average concentration has gone from 154 micrograms of SO2 per cubic meter in 1980 to only 20.2 in 2016 (87 % reduction).

At EPA's 455 nation - wide PM - 2.5 trend monitoring sites the annual average concentration has gone from 13.4 micrograms per cubic meter in 2000 to only 7.7 in 2016.

Not exact matches

The averages and annual tonnages say little about the distribution of element concentrations, which vary widely — by a factor of up to 100 — from one treatment plant to another.

ACPI assumes a 1 percent annual increase in the rate of greenhouse gas concentrations through the year 2100, for little change in precipitation and an average temperature increase of 1.5 to 2 degrees centigrade at least through the middle of 21st century.

The typical annual income for a college graduate here is almost $ 51,000, the concentration of young adults is above average at 24 percent, and the crime rate is distinctly low at less than one violent incident per 1,000 residents.

... Polar amplification explains in part why Greenland Ice Sheet and the West Antarctic Ice Sheet appear to be highly sensitive to relatively small increases in CO2 concentration and global mean temperature... Polar amplification occurs if the magnitude of zonally averaged surface temperature change at high latitudes exceeds the globally averaged temperature change, in response to climate forcings and on time scales greater than the annual cycle.

To properly appreciate it, here are the annual average CO2 concentrations for four stations posted by Ferdinand Engelbeen in a discussion at Climate Etc:

With such a methodology, the average annual direct flood damage for three Australian drainage basins was projected to increase by a factor of four to ten under conditions of doubled atmospheric CO2 concentrations (Schreider et al., 2000).

Climatologist Dr. Pielke Sr. rips RealClimate.org's claims: «It is straightforward to shed doubt on Gavin Schmidt's (and the IPCC) claim» — «If the increase in anthropogenic greenhouse gas concentration were so dominate we would expect the global average [annual] lower troposphere temperature to more - or less monotonically continue to rise in the last decade or so.

Observations of annual mean concentrations of O2, centred on January 1, are shown from the average of the Alert and La Jolla monitoring stations (Keeling et al., 1996b; Manning, 2001; solid circles) and from the average of the Cape Grim and Point Barrow monitoring stations (Battle et al., 2000; solid triangles).

Consistent with this, the annual average atmospheric CO2 measurement stations in the Northern Hemisphere (NH) record slightly higher CO2 concentrations than stations in the Southern Hemisphere (SH).

The World Meteorological Organization's Annual Greenhouse Gas Bulletin raised serious concerns about a new high average global concentration of carbon dioxide in the atmosphere.

The 2007 IPCC report found that the cost of actions to stabilize concentrations of heat - trapping emissions at a level that gives us a good chance of avoiding dangerous warming would amount to less than a 0.12 percent reduction in average annual global gross domestic product (GDP) growth rate in 2050.

ECS is the increase in the global annual mean surface temperature caused by an instantaneous doubling of the atmospheric concentration of CO2 relative to the pre-industrial level after the model relaxes to radiative equilibrium, while the TCR is the temperature increase averaged over 20 years centered on the time of doubling at a 1 % per year compounded increase.

Chylek et al. (1996a) estimated an upper bound for increased absorption of solar radiation of 1 to 3 Wm - 2 (global and annual average) for a black carbon concentration of 0.5 mgm - 3.

Stabilising CO2 concentrations in the atmosphere at any given level, already at 393 parts per million and rising at an average 2.3 ppm per year, requires annual emission be reduced more than 80 per cent below current levels eventually.

The annual average is about 0.25 of the peak — but you expect as well that the reflected SW would not vary as much as you suggest albedo of oceans being influenced by «solar zenith angle, wind speed, transmission by atmospheric cloud / aerosol, and ocean chlorophyll concentration.»

For a conversion factor of 2.78 Tg (CH4) per ppb and an atmospheric concentration of 1,774 ppb, the atmospheric burden of CH4 in 2005 was 4,932 Tg, with an annual average increase (2000 — 2005) of about 0.6 Tg yr — 1.

This chart, from Gagné et al, shows the area - averaged annual mean sea ice concentration anomaly between 1950 and 2005.

Levels of greenhouse gases such as carbon dioxide and nitrous oxide continue to climb, the report authors say; atmospheric CO2 concentrations reached a global average of 397.2 ppm last year, compared with the average of 354.0 in 1990, the first year the annual State of the Climate report was issued.

[71][72] Because of the way air is trapped in ice (pores in the ice close off slowly to form bubbles deep within the firn) and the time period represented in each ice sample analyzed, these figures represent averages of atmospheric concentrations of up to a few centuries rather than annual or decadal levels.

CO2 concentrations reach an annual peak every May, but the average in May 2017 was well above that of previous years.

T is the simple fit to the 63 - years moving average GMST and CO2 is the annual CO2 concentration in the atmosphere.

If you write that the atmospheric concentration of carbon dioxide is «widely accepted as being about 350 parts per million», and walk away, it doesn't do much good for me to answer that it is known with high confidence to be between 385 and 390 parts per million (in 2009, on a global annual average).

Annual mean CO2 concentrations are the arithmetic mean of the monthly averages for the year.

The Kalamazoo area in particular has the highest concentration of medical assisting jobs where the annual mean wage is over $ 28,700, which is on par with the national average for the profession.