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In a statement released this morning, President Barack Obama said he has requested that US Environmental Protection Agency (EPA) Administrator Lisa Jackson withdraw the agency’s draft Ozone National Ambient Air Quality Standards (NAAQS) rulemaking. Earlier post.) National Ambient Air Quality Standards (NAAQS).
Ozone levels across much of North America and Europe dropped significantly between 2000 and 2014. People living in parts of southern Europe, South Korea and southern Japan and China also experienced more than 15 days a year of ozone levels above 70 ppb. Trends in daily maximum ozone levels (known as 4MDA8) at urban and non-urban sites.
A study by an international team led by scientists at the University of East Anglia have identified four new man-made gases in the atmosphere, all of which are contributing to the destruction of the ozone layer. CFCs are the main cause of the hole in the ozone layer over Antarctica. —Lead researcher Dr. Johannes Laube.
Denver represents an interesting case study for exploring potential PHEV impacts because it violates the federal air quality standard for ozone and because several large EGUs [electricity generating units] are located in or near the urbanized area. Ozone concentration increases were modeled for small areas near central Denver.
Emissions of one of the chemicals most responsible for the Antarctic ozone hole are on the rise, despite an international treaty that required an end to its production in 2010, a new study by researchers at NOAA and their colleagues shows. —NOAA scientist Stephen Montzka, lead author of the paper.
The decrease in CO 2 equivalent emissions of ODSs (ozone-depleting substances: CFCs, halons, HCFCs, and others) may be offset by the projected increase in their non-ozone depleting substitutes (HFCs) (lines designated as HFC scenarios). Climate and the Ozone Layer. Source: UNEP. Click to enlarge.
India’s Minister of Environment, Jairam Ramesh, hosted US Deputy Assistant Secretary of State for Environment, Daniel A. HFCs are chemicals are potential substitutes for ozone-depleting and climate-warming CFCs and HCFCs currently being phased out under the Montreal Protocol treaty to protect the ozone layer.
Surabi Menon, Hashem Akbari, Sarith Mahanama, Igor Sednev and Ronnen Levinson (2010) Radiative forcing and temperature response to changes in urban albedos and associated CO 2 offsets. 5 014005 doi: 10.1088/1748-9326/5/1/01400.
NO x is a precursor for both ground level ozone and secondary PM 2.5 which are regulated under the National Ambient Air Quality Standards (NAAQS) because of their adverse effects on human health and the environment. —“Technology Feasibility for Heavy-Duty Diesel Trucks in Achieving 90% Lower NO x Standards in 2027”.
Nitrous oxide is a potent greenhouse gas that contributes to climate change and stratospheric ozone destruction. Human activities, including fossil fuel combustion and intensive agriculture, have increased the availability of nitrogen in the environment. 2010) Nitrous oxide emission from denitrification in stream and river networks.
As planes fly at high altitudes, their impact on ozone and clouds is disproportionately high, though short lived. Jens Borken-Kleefeld, Terje Berntsen and Jan Fuglestvedt (2010) Specific Climate Impact of Passenger and Freight Transport. Car travel emits more carbon dioxide than air travel per passenger mile. Jens Borken-Kleefeld.
Pål Börjesson, researcher in Environment and Energy Systems at Lund University. Besides greenhouse gases, environmental effects such as eutrophication, acid rain, tropospheric ozone and emissions of particles were included in the study, along with emissions from the use of biofuels in light and heavy vehicles. A hat-tip to John!).
As of 2010, biofuel production was contingent on subsidies, tax credits, the import tariff, loan guarantees, RFS2, and similar policies. However, air-quality modeling suggests that production and use of ethanol to displace gasoline is likely to increase air pollutants such as particulate matter, ozone, and sulfur oxides.
SOAs are tiny particles that are formed in air and make up typically 40% to 60% of the aerosol mass in urban environments. The use of petroleum-derived fuels is an important source of reactive gas-phase organic carbon that provides key precursors to the formation of secondary OA (SOA) and tropospheric ozone. Earlier post.).
The baseline was 2010 and the end of the assessment 2020. and EC by around 40% and 60% respectively, from 2010 to 2020. Achten (2016) “Non-exhaust PM emissions from electric vehicles,” Atmospheric Environment , Volume 134, Pages 10-17, doi: 10.1016/j.atmosenv.2016.03.017. in Belgium. Hooftman et al. 2014.09.075. Victor R.J.H.
The US Environmental Protection Agency (EPA) will reconsider the 2008 primary and secondary ozone standards. In 2008, EPA established a new primary 8-hour standard for ozone of 0.075 parts per million (ppm), and a new secondary standard set at a form and level identical to the new primary standard. ppm standard, due to rounding.
Neutral richii @ Apr 19th 2009 5:28PM @ everyone, I can see what your trying to say, that without gas powered vehicles that a much larger strain will be put on electrical facilities that also contribute to air pollution and degrade our environment. but its never even been close to the amount of garbage that gas power vehicles produce.
In a new study published online 10 March in the ACS journal Environmental Science and Technology , however, Stanford University professor Mark Jacobson finds that local CO 2 emissions in isolation may increase local ozone and particulate matter. Jacobson, 2010. Jacobson (2010) Enhancement of Local Air Pollution by Urban CO 2 Domes.
Counties projected to violate proposed Primary 8-hour Ground-Level Ozone Standards in 2020. The United States Environmental Protection Agency has proposed the strictest standards to date for ground-level ozone. EPA is also proposing to set a separate “secondary” standard to protect the environment within the range of 7-15 ppm-hours.
A new study led by researchers at the University of North Carolina at Chapel Hill has found that deaths related to air pollution in the US were nearly halved between 1990 and 2010. and ozone from a 21-year computer simulation of air pollution across the US. Trends in the total mortality burden (black) for PM 2.5 (a,
The founding coalition partners are Bangladesh, Canada, Ghana, Mexico, Sweden, and the United States, together with the UN Environment Programme (UNEP). Such pollutants together account for approximately one-third of current global warming, have significant impacts on public health, the environment, and world food productivity.
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