Green Car Congress
SEPTEMBER 16, 2009
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.
Green Car Congress
JANUARY 7, 2010
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.
Green Car Congress
JULY 10, 2009
Through a recent modeling experiment, a team of NASA-funded researchers have found that future concentrations of carbon dioxide and ozone in the atmosphere and of nitrogen in the soil are likely to have an important but overlooked effect on the cycling of water from sky to land to waterways. Cronin, J. Melillo, D. Kicklighter, C.
Green Car Congress
MARCH 17, 2010
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. Although the health impacts of such changes are uncertain, he notes, they are of concern.
Green Car Congress
MAY 1, 2018
They found that levels of pollutants that can contribute to the formation of ground-level ozone, or smog, have failed to continue a fairly steady decline as estimated by the US Environmental Protection Agency. These results show that meeting future air quality standards for ozone pollution will be more challenging than previously thought.
Green Car Congress
OCTOBER 17, 2013
and O 3 pollution at levels deemed harmful to health by the World Health Organisation (WHO), according to the latest assessment of air quality in Europe, published by the European Environment Agency (EEA). Lower proportions of EU citizens were exposed to levels of these pollutants exceeding the limits or targets set out in EU legislation.
Green Car Congress
APRIL 2, 2009
The study by Nadine Unger, Drew Shindell and James Wang will appear in an upcoming issue of the journal Atmospheric Environment. 2009) Click to enlarge. S1 offers additional improvements to ozone and black carbon air quality whereas S2 implies substantial degradation of sulfate air quality. Environ. , Unger et al.
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