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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.
Cities restricted the number of cars on the road, coal-fired power plants reduced emissions or were shuttered and replaced with natural gas. pollution is falling, harmful ground-level ozone pollution is on the rise, especially in large cities. There was so much particulate matter in Chinese cities that it stunted the ozone production.
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.
This analysis examined the effect of flight distance on greenhouse gas emissions per passenger, and compared emissions from flying different distances with annual emissions from driving. Greenhouse gas emissions were examined for 17 nonstop flights with round-trip distances ranging from 131 miles to 19,040 miles. by Michael Sivak.
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.
Five technology paths for very-low-NO x and GHG emissions from heavy-duty natural gas engines. The “Pathways to Near-Zero-Emission Natural Gas Heavy Duty Vehicles” report, authored by GNA on behalf of Southern California Gas Co. Click to enlarge. Click to enlarge. Background. Click to enlarge.
The US Environmental Protection Agency (EPA) proposed standards to reduce harmful air pollution from oil and gas drilling operations. Natural gas production in the USis growing, with more than 25,000 new and existing wells fractured or re-fractured each year. Methane, the primary constituent of natural gas, is a potent greenhouse gas.
After a critical review of the literature on the air impacts of increased natural gas acquisition, processing, and use, a team of US researchers has determined that that actual measurement data on various individual segments of the natural gas life cycle are sparse or critically lacking. well production end-of-life.
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.
Molecules called Criegee intermediates—carbonyl oxides—are important atmospheric reactants, but only indirect knowledge of their reaction kinetics has been available. However, until 2008 no gas-phase Criegee intermediate had been observed, and rate coefficients derived from indirect measurements spanned orders of magnitude.
million US Department of Energy (DOE) grant to demonstrate a pre-production Renewable Natural Gas (RNG) hybrid 4,300 hp line-haul locomotive. In several weeks, OptiFuel will start taking orders, in 49 of the US states, for a new line of affordable 800 hp to 3,200 hp, 100% natural gas freight and transit locomotives.
The US Environmental Protection Agency (EPA) released its latest set of proposed standards to reduce emissions of methane and volatile organic compounds (VOCs) from the oil and natural gas industry. The proposal also includes incentives to spur the oil and gas industry to minimize leaks.
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.
coal, oil, natural gas, and biomass). 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.
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. The gas is produced primarily during the combustion of gasoline in vehicle engines and coal in power plants.
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.
For the first time, observed Southern Hemisphere greenhouse gas (GHG) data can be easily accessed by the public on a new CSIRO website. The atmospheric level of carbon dioxide, which is the most important long-lived greenhouse gas influenced by human activities, is at its highest level in more than a million years. per cent each year.
The program funds projects to encourage the development and use of new technologies and alternative and renewable fuels, including electricity, natural gas, biomethane, hydrogen, and gasoline and diesel substitutes, such as cellulosic ethanol (derived from woody materials, including agricultural waste), and biodiesel from waste grease.
BP will convert approximately 100 diesel municipal vehicles, including several dozen school buses, to operate on compressed or liquefied natural gas and will construct four refueling stations for the converted vehicles. Exposure to asbestos, a known human carcinogen, can cause asbestosis and two types of cancer: lung cancer and mesothelioma.
million from FTA’s Transit Investment in Greenhouse Gas and Energy Reduction (TIGGER) III Program. TIGGER III grants, which will also use a competitive selection process, will be awarded based on a project’s ability to reduce energy consumption and greenhouse gas emissions and provide a return on the investment.
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. What is the importance of natural emissions to the ozone formation process?
Reducing the greenhouse gas emissions from MACs have been under investigation since the late 1990s; cars equipped with R134a (tetrafluoroethane) MAC systems produce emissions corresponding to 7 grams of CO 2 per driven kilometer. It has a high cooling capacity and is available worldwide at low cost in the required qualities.
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.
Having approval for such a high octane certification fuel would, the EPA proposed in the Tier 3 Notice of Proposed Rulemaking: help manufacturers that wish to raise compression ratios to improve vehicle efficiency, as a step toward complying with the 2017 and later light-duty greenhouse gas and CAFE standards (2017 LD GHG). psi RVP and 7.8
Cummins Westport ISL G near-zero (NZ) natural gas engine ( earlier post ) meets and exceeds the certification standards during a full range of duty cycles. g/bhp-hr, which is 90% cleaner than EPA’s current NO x emission standard and 90% cleaner than the cleanest available diesel engine. Cycle averaged NO x emissions for the ISL G NZ 8.9
Nitrous oxide is a potent greenhouse gas that contributes to climate change and stratospheric ozone destruction. It is produced via a microbial process called denitrification, which converts nitrogen to nitrous oxide and an inert gas called dinitrogen.
The AB 32 Scoping Plan, which guides development and implementation of California’s greenhouse gas emission reduction programs. 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.
Pechman for the Western District of Washington has ruled that the Washington Department of Ecology, Northwest Clean Air Agency, and Puget Sound Clean Air Agency must regulate greenhouse gas emissions (GHGs) from the five oil refineries operating in Washington State. matter, sulfur dioxide, ozone, nitrogen dioxide, carbon monoxide, and lead.
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 Cummins offers its own line of Near-Zero NO x engines running on natural gas.
Improving access to cleaner forms of transportation, like electrified public transport and active commuting by cycling and walking, would not only bring down NO 2 levels, but would also reduce asthma, enhance physical fitness, and cut greenhouse gas emissions. —Susan Anenberg.
Volatile organic compounds (VOC), which include hydrocarbons, are major air pollutants as well as precursors of harmful compounds such as tropospheric ozone and secondary organic aerosols. The research is published in the journal Journal of Geophysical Research: Atmospheres.
The committee that wrote the report focused on monetizing the damage of major air pollutants—sulfur dioxide, nitrogen oxides, ozone, and particulate matter—on human health, grain crops and timber yields, buildings, and recreation. Most vehicle and fuel combinations had similar levels of greenhouse gas emissions in 2005.
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. These compounds in un-burned gasoline and diesel fuel dominate vehicular emissions of reactive gas-phase carbon that have the potential to form SOA.
NO x is a precursor for both ground level ozone and secondary PM 2.5 It is important to state that there are several technology paths to achieve these levels of emissions, and some of them can simultaneously lower greenhouse gas emissions, such that the NO x reductions do not compete with the CO 2 reductions.
Specifically, the proposed rule updates the current prohibition under section 608 of the Clean Air Act against knowingly venting, releasing or disposing of ozone-depleting (ODS) and substitute refrigerants and extends the requirements, as appropriate, to non-ozone-depleting substitute refrigerants, such as hydrofluorocarbons (HFCs).
The capacity to meet the renewable fuel mandate for cellulosic biofuels will not be available unless the production process is unexpectedly improved and technologies are scaled up and undergo several commercial-scale demonstrations in the next few years. Greenhouse gas emissions. Barriers and opportunities.
The costs of transition are generally favorable compared to other available CO 2 reduction technologies for motor vehicles. MAC technology and equipment is generally of a commodity nature and is available through third-party suppliers to any vehicle manufacturer.
In Chile, the current procedure is to capture the gas, dissolve it in sulfuric acid and then transform it into solid calcium arsenate or calcium arsenite in a process known as precipitation. Other project partners are also evaluating UV- and ozone-assisted as well as microbial oxidation processes. —Anna-Lisa Bachmann.
Molecules called Criegee intermediates—carbonyl oxides—are important atmospheric reactants, but until recently, only indirect knowledge of their reaction kinetics has been available. Earlier post.). The new measurements will provide further insight into hydrocarbon combustion and atmospheric chemistry.
60% of ground-level ozone (O 3 ) precursors, 6% of fine particulate matter (PM 2.5 ), and 22% of greenhouse gases (GHGs) emitted. In general, methods presented here can provide insight into any spatially or temporally inhomogeneous environmental impact categories, such as water quality and availability, soil properties, or wildlife habitats.
Thanks to the Infrastructure Investment and Jobs Act’s (IIJA), there is $5 billion available in funding for clean school buses. Reducing vehicle emissions Electric school buses, and their electric car and truck cousins, produce no tailpipe emissions, which is a big step in lowering air pollution and greenhouse gas emissions.
Regarding future Greenhouse Gas (GHG) emission regulations (Pavley 2), staff is evaluating studies of the feasibility and cost of advanced technologies to reduce GHG emissions that could achieve widespread sales and acceptance in the 2017-2025 timeframe. —LEV III discussion paper.
The move to reduce the number of polluting trucks on the road integrates with a series of other measures to reduce vehicular air pollution in Haifa Bay, such as the massive installation of vapor recovery systems in gas stations, the move to convert buses and garbage trucks to natural gas, and more.
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