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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.
pollution is falling, harmful ground-level ozone pollution is on the rise, especially in large cities. Ozone is the main ingredient in smog and has been studied since it began choking cities in the US in the early 1950s. There was so much particulate matter in Chinese cities that it stunted the ozone production. Ke Li, Daniel J.
Drought conditions can have complicated effects on ozone air quality, so to better understand the process, researchers have analyzed data from two ozone-polluted cities before, during and after the California drought. However, plants also decrease air ozone levels by taking the gas up through pores in their leaves.
The US Environmental Protection Agency (EPA) has announced two final rules that will further reduce the availability and use of hydrochlorofluorocarbons (HCFCs), which are primarily used as refrigerants and harm the ozone layer. The 2010 HCFC Regulations.
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.
Among the many climate-related vulnerabilities that can impact its mission, the US Environmental Protection Agency (EPA) cites a likely increase in tropospheric ozone pollution as potentially making it more difficult to attain National Ambient Air Quality Standards ( NAAQS ) in many areas with existing ozone problems.
The California Air Resources Board today approved a statewide plan for attaining the federal health-based standard for ozone, typically experienced as smog. The 2022 State Implementation Plan Strategy identifies the state’s control strategy for meeting the federal 70 parts per billion, 8-hour ozone standard over the next 15 years.
The hydrogen produced during electrolysis can be injected into the gas grid, used as fuel, converted into methane or methanol, and made available as industrial feedstock. Micropollutants such as pharmaceuticals, pesticides and cosmetics can be removed from wastewater when ozone is introduced.
The coordinated package of regulations will reduce emissions of greenhouse gases and ozone- and smog-causing pollutants from new passenger cars, trucks, and SUVs starting in model year 2026. Their independent approval of the Clean Car Rule allows California’s Advanced Clean Cars to be implemented statewide in New Mexico beginning 1 July 2022.
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.
The US, Canada, and Mexico have submitted a proposal to strengthen climate protection under the Montreal Protocol— the international treaty that phases out the production of a number of substances responsible for ozone depletion. The proposal targets the production and use of HFCs, a group of “super” greenhouse gases. Source: IGSD.
As levels of ozone and fine particulate pollution (PM 2.5 ) rise, more patients end up in the ER with breathing problems, according to the largest US study of air pollution and respiratory emergency room visits of patients of all ages. In “Age-specific Associations of Ozone and PM 2.5 among children, 5.1% among adults under 65 and 3.3%
The chemical, which does not deplete the ozone layer, may now be used in air conditioning for new cars and light trucks. Using HFO-1234yf is one option available to automakers. Prior to HFC-134a, car air conditioners generally used CFC-12, a potent greenhouse gas and ozone-depleting substance.
The California Air Resources Board (CARB) voted to approve an updated plan for the South Coast Air Basin aimed at further cutting smog-forming emissions to attain the federal 8-hour ozone standard. The remaining reductions are reasonably available from further action at the federal level, CARB said. —CARB Chair Mary D.
The Federal Transit Administration (FTA) announced the availability of $24.9 million is available for buses and $3.3 million is available for supporting facilities and related equipment. A maintenance area, as defined in section 5303, for ozone or carbon monoxide. Of that amount, $21.6 7407(d)); or.
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.
Among the non-CO 2 pollutants are hydrofluorocarbons (HFCs), methane, tropospheric ozone, and black carbon soot. Technology is already available to reduce these climate-forcing agents, and doing so would produce strong collateral benefits. Reducing tropospheric ozone can improve public health as well as agricultural productivity.
Among the findings: Summer surface ozone (O 3 ) decreases in most locations due to widespread reductions of traffic NO x emissions. Across scenarios, we found the more cars that transitioned to electric power, the better for summertime ozone levels. Seasons and times of day. Schnell et al. —Jordan Schnell.
Molecules called Criegee intermediates—carbonyl oxides—are important atmospheric reactants, but only indirect knowledge of their reaction kinetics has been available. Credit: Marston (2012), Photo credit: Daniel Stein/Istockphoto.com.Click to enlarge. —Welz et al. In a commentary accompanying the main paper by Welz et al. ,
ARB expects that up to $1 million will be available for this solicitation, although funding could be increased to a maximum of $5 million depending on the availability of state funds. Off-road equipment is a significant source of diesel PM, as well as NO x emissions that lead to ozone and secondary PM, ARB noted.
These connections arise because in many cases the agents of concern are the same, and in many cases the sources of the agents are the same or intimately connected.For example, surface ozone is both an air pollutant and a greenhouse gas. The complex roles that ozone and aerosols play in the atmosphere provide examples of such trade-offs.
HFCs are powerful greenhouse gases originally developed as substitutes for ozone-depleting chemicals. A binding legal agreement exists that can cut HFCs now—the Montreal Protocol ozone treaty—and many alternatives to HFCs have already been developed and are waiting for the right regulatory incentive from the Montreal Protocol to be deployed.
After ten years in orbit, the Ozone Monitoring Instrument (OMI) on NASA’s Aura satellite has been in orbit sufficiently long to show that people in major US cities are breathing less nitrogen dioxide. More before-and-after images are available on flickr. It’s also a good proxy for the presence of air pollution in general.
reductions; annual NO x reductions; and ozone-season NO x. Ozone Season NO x Power Plant Emissions. Under the rule, 27 states in the eastern half of the country will work with power plants to cut air pollution, which leverages widely available, proven and cost-effective control technologies. NO x emissions will drop by 54%.
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. was recently certified by CARB and is expected to be commercially available mid-year 2016.
The results, published in an open-access paper in the journal Science , suggest that the focus of efforts to mitigate ozone formation and toxic chemical burdens need to be adjusted, the authors suggested. Total VOC emission factors for end uses of petrochemical sources in the study. 1A) and sales data of volatile chemical products.
Global ozone-depleting substances (ODSs) and HFC emissions (A), global CO 2 and HFC emissions (B), and ODS, HFC, and CO 2 global RF (C) for the period 2000–2050. These HFCs, gases used in refrigerators and air conditioners, are substitutes for ozone-depleting gases, but they are also strong greenhouse gases. Velders et al.
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. Resources.
The program will demonstrate that a suite of commercially available, EPA-rail-certified engines present a near-term, low-risk solution to create an affordable RNG hybrid line-haul locomotive with near zero emissions while simultaneously improving fuel cost by 50%. g/bhp-hr of NOx, a reduction of 400 times.
The graphs we’ve made available online will enable people to examine the evidence about the major driver of recent climate change. Data for the synthetic greenhouse and ozone depleting gases, such as CFCs, also are available.
Clean Fuels grant recipients will be chosen through a competitive selection process based on their ability to help communities achieve or maintain the National Ambient Air Quality Standards for ozone and carbon monoxide, while supporting emerging clean fuel and advanced propulsion technologies for transit buses.
This measure is critical for attaining federal health-based air quality standards for ozone in 2031 in the South Coast and San Joaquin Valley air basins, and fine particulate matter (PM 2.5 ) standards in the next decade. The workshop will be available via webcast for those unable to attend in person. Warranty corrective action.
Furthermore, myclimate accounts for other warming effects of aircraft emissions (through changes in the ozone layer, initiation of contrails, formation of cirrus clouds, etc.) First, very long flights tend to provide more passenger space (even flying economy class), resulting in fewer passengers per available space.
The Clean Air Act (CAA) requires the use of low-volatility gasoline during the summer months in order to limit the formation of ozone pollution. Volatility is the property of a liquid fuel that defines its evaporation characteristics.) Reid vapor pressure (RVP) is a common measure of and generic term for gasoline volatility.
R134a replaced CFC-12 as the MAC refrigerant in the early 1990s due to the negative impact of CFCs on the Earth’s ozone layer. It has a high cooling capacity and is available worldwide at low cost in the required qualities. CO 2 is an A1 refrigerant, indicating minimal toxicity and non-flammability.
Energy Secretary Steven Chu announced up to $10 million is available ( DE-FOA-0000669 ) this year to demonstrate and deploy electric transportation technologies for cargo vehicles, such as trucks, locomotives and forklifts. Applications for funding will be accepted until 8 p.m.
Furthermore, commercially available technologies, such as fuel efficient passenger vehicle tires, can be utilized by both new and in-use vehicles in the near-term to achieve GHG emission reductions. Achieving our long-term climate goal and 2032 ozone standards will require a much deeper penetration of ZEVs into the fleet.
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.
Under the proposal, automakers could petition the EPA for approval of a higher octane, higher ethanol content test fuel if: they could demonstrate that such a fuel would be used by the operator and would be readily available nationwide; vehicles would not operate appropriately on other available fuels; and. psi RVP and 7.8
The settlement requires that BP address violations of Clean Air Act requirements limiting emissions of stratospheric ozone-depleting hydrochlorofluorocarbons (HCFCs) from leaking cooling appliances. HCFCs and other ozone-depleting substances, when released into the environment, destroy the earth's protective stratospheric ozone layer.
Alternative-fuel technology company ROUSH CleanTech has developed the first available propane autogas engine certified to California Air Resources Board’s (CARB’s) optional low oxides of nitrogen emissions standard for heavy-duty engines with 0.02 grams per brake horsepower-hour (g/bhp-hr). Earlier post.). g/bhp-hr heavy-duty engine standard.
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.
A lawsuit against the agencies, filed by the Washington Environmental Council and Sierra Club in March, claimed that the state agencies had violated their obligation under Washington’s State Implementation Plan (SIP) to determine and impose “reasonably available control technologies” on refineries to control greenhouse gas emissions.
Reports like this one help us to prepare for increasing demands on Arctic resources so that better decisions can be made about how to manage and protect these more valuable and increasingly available resources. —Monica Medina, NOAA principal deputy under secretary of commerce for oceans and atmosphere.
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