This site uses cookies to improve your experience. To help us insure we adhere to various privacy regulations, please select your country/region of residence. If you do not select a country, we will assume you are from the United States. Select your Cookie Settings or view our Privacy Policy and Terms of Use.
Cookie Settings
Cookies and similar technologies are used on this website for proper function of the website, for tracking performance analytics and for marketing purposes. We and some of our third-party providers may use cookie data for various purposes. Please review the cookie settings below and choose your preference.
Used for the proper function of the website
Used for monitoring website traffic and interactions
Cookie Settings
Cookies and similar technologies are used on this website for proper function of the website, for tracking performance analytics and for marketing purposes. We and some of our third-party providers may use cookie data for various purposes. Please review the cookie settings below and choose your preference.
Strictly Necessary: Used for the proper function of the website
Performance/Analytics: Used for monitoring website traffic and interactions
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).
Levels of two major air pollutants have been reduced significantly since lockdowns began in response to the COVID-19 pandemic, but a secondary pollutant—ground-level ozone—has increased in China, according to new research. Ozone is harmful to humans at ground-level, causing pulmonary and heart disease. —Guy Brasseur.
Springtime ozone distributions for 1984, 1995–2008 in the mid-troposphere (3.0–8.0 Springtime ozone levels above western North America are rising primarily due to air flowing eastward from the Pacific Ocean, a trend that is largest when the air originates in Asia. km), and air mass source regions. Credit: Nature, Cooper et al.
US EPA Region 9 8-hour ozone trends, 1979-2000. These State Implementation Plans (SIPs) are the roadmaps to meeting the 1997 8-hour ozone National Ambient Air Quality Standards (NAAQS) of 0.08 In 1997, EPA first established the 8-hour ozone standard, which replaced the older 1-hour ozone standard (0.12 Source: EPA.
Relative contribution of major greenhouse gases to the overall change in radiative forcing between 1979 and 1984 (a) and from 2003 to 2008 (b). Atmospheric levels of major greenhouse gases continue to increase, according to the World Meteorological Organization’s (WMO) 2008 Greenhouse Gas Bulletin. from 2007 to 2008.
Exposure to ozone at levels currently deemed safe by the NAAQS clean air standards can have a significant and negative effect on lung function, according to researchers at the University of California, Davis. The previous primary and secondary standards were identical 8-hour standards, set at 0.08 Earlier post.).
related damages, researchers from Carnegie Mellon University and Stanford have found that, US-economy-wide, gross external damage (GED) due to premature mortality has decreased by more than 20% from 2008 to 2014. GED was calculated for the 3 most recent NEI years: 2008, 2011, and 2014. In a new study of PM 2.5 Tschofen et al.
The first peer-reviewed study to directly quantify how emissions from oil and natural gas (O&NG) activities influence summertime tropospheric ozone (O 3 ) pollution in the Colorado Front Range confirms that chemical vapors from oil and gas activities are a significant contributor to the region’s chronic ozone problem.
Comparison of annual N 2 O ODP-weighted emissions from the 1990s with emissions of other ODS in 1987 and in 2008. Currently, anthropogenic N 2 O emissions represent the largest contribution to ozone depletion. Today, nitrous oxide emissions from human activities are more than twice as high as the next leading ozone-depleting gas.
The San Joaquin Valley has been attainment for Carbon Monoxide (CO) since 1994, reached attainment for the federal PM 10 standard in 2008, and demonstrated attainment of the federal 1-hour ozone standard in 2014. The District is currently working on reaching attainment for the federal 8-hour ozone and PM 2.5 standards.
Funded in part by a $5-million zero-emissions grant from the Federal Aviation Administration, the electric buses replace the aging compressed natural gas bus fleet that has been operating at SJC since 2008. The electric bus fleet is anticipated to reduce ozone emissions by 1.1
The modeled 2028 base year 8-hour ozone design values were found to be above the 70 ppb NAAQS for 75 monitoring locations. By 2035, 46 states will be in attainment with the 2015 ozone NAAQS of 70 ppb (only counties in California and Utah remain in nonattainment). Source: MECA. ppb in the west (San Bernardino, CA) and 4.9
VOCs, primarily emitted from the tailpipes of vehicles, are a key ingredient in the formation of ground-level ozone which, at high levels, can harm people’s lungs and damage crops and other plants. —lead author Carsten Warneke, Ph.D.,
Since 1990, nationwide air quality has improved significantly for the six common air pollutants: ground-level ozone; particle pollution; lead; nitrogen dioxide; carbon monoxide; and sulfur dioxide, according to the US Environmental Protection Agency (EPA) report “Our Nation’s Air - Status and Trends through 2008”. annual PM 2.5
The existing US NO x cap-and-trade program lowered 2008 summertime NO x emissions from power plants and large industrial sources 62% compared to year 2000 levels and 75% lower than in 1990, according to a report released by the US Environmental Protection Agency (EPA). State level ozone emissions in the NBP, from 1990 to 2010 (projected).
Bromine also can remove ozone from the lowest layer of the atmosphere, the troposphere. Despite ozone’s beneficial role blocking harmful radiation in the stratosphere, ground-level ozone is a harmful pollutant. Bromine then reacts with a gaseous form of mercury, turning it into a pollutant that falls to Earth’s surface.
Jakober, 2008). lower ozone formation potential of the carbonyl compounds present than DF under the identical operating conditions. Kleeman (2008) “Carbonyl Emissions from Gasoline and Diesel Motor Vehicles,”. Tests were performed under constant speed/varying load and under constant load/varying speed. CFT had 16.5–44.1%
Ozonolysis—the cleavage of carbon-carbon double bonds through reaction with ozone—is a reaction that plays a key role in a number of fields, including synthetic chemistry and tropospheric removal of unsaturated hydrocarbons. —Professor Dudley Shallcross, Professor in Atmospheric Chemistry at The University of Bristol.
Between 2002 and 2008, PowerTrain imported 79,830 nonroad engines or pieces of equipment into the US that were not covered by a Clean Air Act-required certificate of conformity. Ground level ozone can trigger a variety of health problems, including chest pain, coughing, throat irritation and congestion. and Tool Mart, Inc.
Between 2002 and 2008, PowerTrain imported 79,830 nonroad engines or pieces of equipment into the US that were not covered by a Clean Air Act-required certificate of conformity. Ground level ozone can trigger a variety of health problems, including chest pain, coughing, throat irritation and congestion. and Tool Mart, Inc.
The Cross-State Air Pollution Rule replaces and strengthens the requirements of the 2005 Clean Air Interstate Rule (CAIR), which the US Court of Appeals for the DC Circuit ordered EPA to revise in 2008. reductions; annual NO x reductions; and ozone-season NO x. Ozone Season NO x Power Plant Emissions. Source: EPA. reductions.
Without a nationwide ultra-low NO x emission standard, SCAQMD argues, California will not be able to meet the 2023 deadline for achieving the federally mandated 8-hour ozone standard, which was adopted in 1997 and set at 80 parts per billion. liter engine, produced by Cummins Westport Inc., Earlier post.).
2009), reproduced from Ramanathan and Feng (2008) Click to enlarge. HFCs are powerful greenhouse gases originally developed as substitutes for ozone-depleting chemicals. The Montreal Protocol has already delayed climate change by seven to 12 years, and put the ozone layer on the path to recovery later this century. Ramanathan.
The changes made to the statewide Voucher Incentive Program, also known as the VIP, will make funding available to a larger variety of trucks that will help owners comply early with the statewide truck and bus regulation passed in 2008. VIP is part of the state’s overall plan to cut toxic diesel emissions 85 percent by 2020.
Because the latter was a $126 billion/year market in 2008, even small differences in GWPs can have large economic consequences. And hydroxyls drive long chains of reactions involving other common gases, including ozone. Similar reactions influence the creation of nitrate aerosols.
Researchers at North Carolina State University are developing an ozone-based pre-treatment technique (ozonolysis) to release sugars from the energy grass miscanthus for production into renewable fuels or chemicals with minimal generation of chemical waste streams and degradation of the carbohydrate components. García-Cubero et al.
Since real-world workboat engines are operating with longer lifespans, the actual nitrogen oxide emission reductions are 52 percent weaker than predicted in EPA’s 2008 Rule calculations. A longer service life reduces the fleet’s turnover rate to cleaner, lower-emitting engines, therefore increasing future-year emission estimates.
Significant climate anomalies 2008/2009. In 2008, the minimum ice extent was 9% greater than in 2007, but still the second lowest on record. The hole in the ozone layer has had a cooling effect on Antarctica, and is partly responsible for masking expected warming on the continent. Source: Climate Change Compendium.
More findings from the CalNex research on a variety of subjects, from the formation of ozone to the interactions of particles and clouds, are being presented at a four-day workshop May 16 through 19 in Sacramento, California.
Approximately 70% of the reductions needed to meet the ozone standard in the South Coast in 2031 would come from existing or proposed regulatory actions. CARB began publicly evaluating controls for SLCPs with the first AB 32 Scoping Plan in 2008 and has held at least 10 workshops and public hearings to gather input.
The regulation has been in development for the past two years since the passage of the Scoping Plan in 2008. There are also provisions to develop international offset programs that could include the preservation of international forests. ARB Staff presentation on Cap-and-Trade Program. Proposed Regulation to Implement.
HCR188C/R441A and HCR188C/R443A are both patented and trademarked zero-ozone-depleting/extremely low global-warming-potential (GWP) hydrocarbon blends. TEGA is ISO 9001:2008 certified, and is one of the main distributors for flammable and non-flammable refrigerants in Europe.
In the August issue of the American Thoracic Society’s American Journal of Respiratory and Critical Care Medicine , it states that exposure to ozone at levels currently deemed safe by the NAAQS clean air standards can have a significant negative effect on lung function. The research found that 6.6 hours of exposure.
Here, RME show advantages for primary energy and GHG, but disadvantages in terms of acidification, eutrophication and ozone depletion. From 2007 to 2008, the share of ethanol in global gasoline type fuel use was estimated to increase from 3.78% to 5.46%, and the share of biodiesel in global diesel type fuel use from 0.93% to 1.5%.
Sustainable Communities : The Sustainable Communities and Climate Protection Act of 2008 (SB 375) directs California’s metropolitan planning organizations to develop sustainable communities strategies that meet regional greenhouse gas reduction targets through integrated land use, housing and transportation planning.
Based on model year 2008 NMOG certification data for vehicles sold in California, 22% of new vehicles are certified as LEV, 55% as ULEV, and 22% as SULEV. Light-duty passenger cars and trucks are responsible for a major fraction of ozone- forming emissions: NO x (15% of California emissions), CO (42%), and ROG (21%).
Unregulated pollutants also include ozone precursors and bioaccumulative and toxic compounds. The second engine was a Ford 2008 6.4 Diesel engine exhaust also includes toxic unregulated pollutants, such as volatile organic compounds (VOCs) like benzene and formaldehyde and polycyclic aromatic hydrocarbons (PAHs) like benzo(a)pyrene.
The global economic crisis 2007/2008 only temporarily reduced emissions. Additionally, reducing transport emissions of particulate matter (including black carbon), tropospheric ozone and aerosol precursors (including NO x ) can have human health and mitigation co?benefits GtCO 2 eq (1.3%) per year from 1970 to 2000.
Research data included 11,390 emergency room visits and hospital admissions made by 7,954 children ages 0 to 18 between 2000 and 2008. and ozone in warm months, and with PM 2.5 , carbon monoxide, nitrogen dioxide and oxides of nitrogen in the cool season. Hospital encounters for asthma were linked to PM 2.5
In response to a Board directive in April 2008, ARB staff developed a plan to further reduce emissions from locomotives and railyards. NO x helps create ground-level ozone, or smog. ARB Chairman Mary Nichols. The emission reductions were to be beyond existing US EPA regulations and ARB regulations and agreements.
The Haifa region began air quality monitoring some 30 years ago; the metropolitan area now has the densest air quality monitoring network in Israel with 27 continuous monitoring stations that measure criteria pollutants including sulfur oxides, nitrogen oxides, ozone, particulates and more.
In order to achieve the 2008Ozone National Ambient Air Quality Standards set by US EPA, CARB estimates that the South Coast Air Basin alone (including Los Angeles) will need an 80% reduction in NO x emissions by 2031. CARB said it looked forward to continued cooperation with the federal agencies on this long-term effort.
This phase was conducted at the Southwest Research Institute (SwRI) in 2007 and 2008 and was the basis for selecting one HHDD engine/control system for health testing in Phase 3. This phase was conducted at SwRI in 2012.
CARB began publicly evaluating controls for SLCPs with the first AB 32 Scoping Plan in 2008. Research now shows that immediate action to cut super pollutants in California will reduce damage to forests and crops, lower background ozone and help clean the air in the state’s most polluted regions, including the Central Valley.
We organize all of the trending information in your field so you don't have to. Join 5,000+ users and stay up to date on the latest articles your peers are reading.
You know about us, now we want to get to know you!
Let's personalize your content
Let's get even more personalized
We recognize your account from another site in our network, please click 'Send Email' below to continue with verifying your account and setting a password.
Let's personalize your content