Sentences with phrase «ambient air concentration»
«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].
https://www.scientificamerican.com/ Not exact matches
Called AmazonFACE (Free - Air Carbon dioxide Enrichment), it's based on a simple idea: For 12 years, researchers will spray pure CO2 into instrumented plots in the rainforest northwest of Manaus, Brazil, raising ambient concentrations to 600 parts per million — a level the world could reach as early as 2050 — all the while taking meticulous measurements to determine how the gas affects the growth of plants.
«The methane concentrations were extraordinarily high, the highest we've seen in ambient samples,» said Blake, who has measured air pollutants across the globe for more than 30 years.
Pallas also serves as one of the sites of the Finnish network for monitoring the concentrations of mercury and other heavy metals, benzo (a) pyrene, O3 and other air pollutants as required by the European legislation on ambient air quality assessment and management.
Pallas is one of the sites of the Finnish network for monitoring the concentrations of mercury and other heavy metals, benzo (a) pyrene, ozone and other air pollutants, as required by the European legislation on ambient air quality.
Ambient levels of PM 2 days before submaximal exercise testing were significantly associated with increased ST - segment depression during the test.17 This finding suggests that air pollution exposure conveys a greater susceptibility to myocardial ischemia, as demonstrated in an experimental study of dogs exposed to CAP.175 These results also offer insight regarding the relationship between exposure to PM and the timing of AMI.11 Significant associations were identified between symptom onset and both acute (levels within 2 hours before symptoms) and subacute (previous - day average concentration) exposures to PM2.5.
Hyundai engineers discovered that occupants start to get drowsy when CO2 levels reached more than 2,000 parts per million, so the new ventilation system helps ensure the cabin maintains a CO2 concentration well below that level at all times using freshly - ventilated ambient air.
The study notes that «It is not physically possible for large enough volumes of air to interact with the surface under normal atmospheric conditions and therefore this method will not remove sufficient molecules of NO2 to have a significant impact on ambient concentrations.»
In this study, the pollution status of particulate matter (PM) in ambient air was investigated based on the concentration data of three important PM fractions (PM2.5, PM10,...
Pallas is one of the sites of the Finnish network for monitoring the concentrations of mercury and other heavy metals, benzo (a) pyrene, ozone and other air pollutants, as required by the European legislation on ambient air quality.
[21] In 2008, measured ambient concentrations near drilling sites in Sublette County, Wyoming were frequently above the National Ambient Air Quality Standards (NAAQS) of 75ppb and have been recorded as high as 1ambient concentrations near drilling sites in Sublette County, Wyoming were frequently above the National Ambient Air Quality Standards (NAAQS) of 75ppb and have been recorded as high as 1Ambient Air Quality Standards (NAAQS) of 75ppb and have been recorded as high as 125 ppb.
Weather and climate affect both the concentration of ground - level ozone in the ambient air and to what degree the stomata are open.»
Millions of electronic CO2 sensors that control ventiliation fans in high occupancy buildings use the consequence of back radiation at a resonant frequency of CO2 to determine concentration in the ambient air.
Because of temporal variabilities in source, composition and concentration of SHS, conventional exposure assessment using indices of SHS, as measured in the ambient air or in the body fluids of exposed individuals, at certain times has failed to estimate long - term SHS exposure 10.»
Dissolved CO2 and CH4 concentrations in surface waters were obtained by equilibrating 2 L of water with 20 mL of ambient air for 3 minutes.
Pace the phrase «any air pollutant,» everything in § 115 points to it being meant to apply only to NAAQS pollutants, i.e., those for which EPA has established a «National Ambient Air Quality Standard»: a numerical value representing the appropriate atmospheric concentration of ozone, particulate matter, etair pollutant,» everything in § 115 points to it being meant to apply only to NAAQS pollutants, i.e., those for which EPA has established a «National Ambient Air Quality Standard»: a numerical value representing the appropriate atmospheric concentration of ozone, particulate matter, etAir Quality Standard»: a numerical value representing the appropriate atmospheric concentration of ozone, particulate matter, etc..
Pallas also serves as one of the sites of the Finnish network for monitoring the concentrations of mercury and other heavy metals, benzo (a) pyrene, O3 and other air pollutants as required by the European legislation on ambient air quality assessment and management.
In addition, the Endangerment Rule authorizes or obligates EPA to establish: (1) greenhouse gas emission standards for heavy trucks, marine vessels, aircraft, locomotives, and other non-road vehicles and engines; (2) greenhouse gas performance standards for potentially dozens of industrial source categories; and, (3) national ambient air quality standards (NAAQS) for greenhouse gases set below current atmospheric concentrations.
The ambient air pollutant concentrations have been decreasing for decades and are going to keep decreasing for the foreseeable future because of existing non-GHG-related regulations.
We present an analysis of how three alternative scenarios for US power plant carbon standards could change fine particulate matter and ozone concentrations in ambient air, and the resulting public health co-benefits.