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A study by a team of researchers from China, the US and Germany suggests that future climatechange may worsen air quality for more than 85% of China’s population, leading to an additional 20,000 deaths each year. and ozone exposure, respectively. and ozone exposure, respectively. Projected changes in mean annual PM 2.5
New analysis has found increasing emissions of several ozone-depleting chemicals despite their production being banned for most uses under the Montreal Protocol—and a loophole in the rules is likely responsible. According to the researchers, emissions from these CFCs currently do not significantly threaten ozone recovery.
Illustration of projected ozonechanges in the South Coast region due to climatechange in 2050. Areas in orange and red could see ozone concentrations elevated by 9 to 18 parts per billion. Our study reveals that climatechange and regional air pollution are intertwined problems. Click to enlarge.
Schematic diagram of the trade-offs between the implications for regional air quality and global climatechange of new policies for management of the atmosphere. The complex roles that ozone and aerosols play in the atmosphere provide examples of such trade-offs. 2010 CalNex Science and Implementation Plan. Source: NOAA.
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.
Extraordinarily cold temperatures in the stratosphere during the winter of 2010/2011 caused the most massive destruction of the ozone layer above the Arctic so far, according to a study by climate researchers at KIT (Karlsruhe Institute of Technology). Their paper appears in the journal Geophysical Research Letters.
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.
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). The contribution of HFCs to climate forcing is currently less than 1% of all greenhouse gases.
used a climate model to analyze the effects of a wide range of chemical species, including carbon dioxide, nitrous oxide, methane, organic carbon, black carbon, nitrate, sulfate, and ozone, from 13 sectors of the economy from 2000 to 2100. Bauer (2010) Attribution of climate forcing to economic sectors. Unger et al.
Lisa P Jackson, Administrator of the US Environmental Protection Agency, issued a public memo to EPA employees detaling “ seven key themes to focus the work of our agency ” in 2010 and beyond. The seven themes are: Taking Action on ClimateChange. Improving Air Quality.
Although it does not solve the root of the climatechange problem—substantial reductions in CO 2 and other climate forcers are essential for that—urban albedo can delay the onset of more severe climate impacts, and reduce the risk of passing the thresholds for abrupt and irreversible climatechanges.
The studies use case studies to demonstrate the co-benefits of tackling climatechange in four sectors: electricity generation, household energy use, transportation, and food and agriculture. Climatechange threatens us all, but its impact will likely be greatest on the poorest communities in every country.
The UN Intergovernmental Panel on ClimateChange (IPCC) released a policymaker’s summary of Working Group III’s (WG III) latest report showing that despite a growing number of climatechange mitigation policies, annual anthropogenic GHG emissions grew on average by 1.0 GtCO 2 eq/yr in 2010. Transport sector.
Climate response to non-CO 2 vehicle emissions. Global and regional zonal mean temperature changes relative to 2010 due to non-CO 2. Bars on the right show uncertainty ranges for 2070, including contributions from both forcing and climate sensitivity (67%; CI). Shindell et al. trillion avoided health damage and $US1.1-4.3
The team used a population-weighted multi pollutant index (PW-MPI), suited for global model output, with the atmospheric chemistry general circulation model EMAC to estimate the impact of anthropogenic emission changes on global and regional air quality in recent and future years (2005, 2010, 2025 and 2050).
Air travel results in a lower temperature change per passenger-kilometer than car travel on the long run; the integrated radiative forcing of air travel is on short- to medium time horizons much higher than for car travel. Per passenger-hour traveled however, aviations climate impact is a factor 6 to 47 higher than the impact from car travel.
That’s three times the amount estimated by the Intergovernmental Panel on ClimateChange (IPCC). Nitrous oxide is a potent greenhouse gas that contributes to climatechange and stratospheric ozone destruction. 2010) Nitrous oxide emission from denitrification in stream and river networks.
The figure includes the direct effects and those indirect effects due to the production of tropospheric ozone and stratospheric water vapor.) Overall, EPA reported a slightly less than 1% drop in methane (CH 4 ) emissions from 2010 to 2011 (from 592.7 12.6%) decrease under 2010 emission levels. a global warming potential of 21.
That the reduction has not materialized—and that global emissions have instead risen—is a puzzle, and may have implications for the Montreal Protocol, the international treaty that was designed to protect the stratospheric ozone layer. This is not the first time that HFC-23 reduction measures attracted controversy.
Compared to the 2010 “Business as Usual” scenario—which includes all adopted emission control measures for the South Coast—NO x levels must be reduced by 65% and by 75% to meet the 2023 and 2032 ozone standards, respectively. An 80% reduction of GHG emissions is targeted for 2050, relative to 1990 levels.
Funding priorities through the ARFVT Program support fuel and vehicle development to help attain the state’s climatechange policies. million ZEVs on the state’s roads.
Ethane reacts with sunlight and other molecules in the atmosphere to form ozone, which at the surface can cause respiratory problems, eye irritation and other ailments and damage crops. A snapshot from a simulation of how Bakken oil field hydrocarbon emissions including ethane affect North American ground-level ozone concentrations.
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. Direct and indirect land use changes were also studied. (A A hat-tip to John!).
Life cycle inventories have typically been presented at global, national, or regional levels—sufficient for understanding global processes such as climatechange and fossil fuel depletion, but insufficient for the analysis of local processes such as air pollution, according to the researchers.
ARB staff reviewed four offset protocols and recommends that they be approved as part of this regulatory package: (1) the Urban Forest Projects Protocol; (2) the US Ozone Depleting Substances Projects Protocol; (3) the Livestock Manure (Digester) Projects Protocol; and (4) the US Forest Projects Protocol. Cap and Trade 2010.
Organic aerosol (OA) in the atmosphere is detrimental to human health and represents a highly uncertain forcing of climatechange. 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.
A NASA-led study has documented an unprecedented depletion of Earth’s protective ozone layer above the Arctic last winter and spring caused by an unusually prolonged period of extremely low temperatures in the stratosphere. The same ozone-loss processes occur each winter in the Arctic.
while the US GDP is projected to grow by 40%, according to the fifth National Communication on US climatechange actions submitted by the US Department of State to the United Nations Framework Convention on ClimateChange. The United States released previous Climate Action Reports in 1994, 1997, 2002, and 2006.
This could explain satellite measurements showing high levels of stratospheric ozone, water vapor and other chemicals over Asia during summer. When sulfur rises into the stratosphere, it can lead to the creation of small particles called aerosols that are known to influence the ozone layer. Science doi: 10.1126/science.1182274.
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. The Joint Task Force will submit its report by 1 August 2011. The United States, Mexico, and Canada also proposed a similar amendment.
Global benefits from full implementation of measures for reduction of short-lived climate pollutants in 2030 compared to the reference scenario. The climatechange benefit is estimated for a given year (2050) and human health and crop benefits are. for 2030 and beyond. Source: UNEP. Click to enlarge. Earlier post.).
Mandatory regional criteria pollutant reduction targets will be established in the 2016 State Implementation Plans (SIPs) with expected reductions on the order of 90% below 2010 levels in the South Coast and similar reductions in the San Joaquin Valley by the year 2032. In 2014, ARB will propose enhancements to strengthen the LCFS.
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