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Study finds pollution emitted near equator has biggest impact on global ozone

Green Car Congress

They found that the increase in ozone burden due to the spatial distribution change slightly exceeds the combined influences of the increased emission magnitude and global methane. Based on their findings, they suggested that emission increases in Southeast, East and South Asia may be most important for the ozone change.

Ozone 230
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EPA proposes stringent new emissions standards for light-, medium-, heavy-duty vehicles for MY 2027 and beyond

Green Car Congress

The US Environmental Protection Agency (EPA) announced two new proposed federal emissions standards spanning light-, medium- and heavy-duty vehicles for model year 2027 and beyond. The light-duty vehicle category includes passenger cars and light trucks consistent with previous EPA criteria pollutant and GHG rules.

EPA 210
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EPA, NHTSA issue One National Program Rule; EPA withdraws CA waiver for GHG and fuel economy

Green Car Congress

This action is based on the premise that federal law preempts state and local tailpipe greenhouse gas (GHG) emissions standards as well as zero emission vehicle (ZEV) mandates. The California waiver authority exists because California has uniquely difficult problems with ozone-forming pollutants. Earlier post.)

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Northwestern/Princeton study explores air quality impacts of aggressive conversion to EVs

Green Car Congress

The exponentially increasing global market share of EVs has prompted research on their efficacy in reducing greenhouse gases, but comparatively little effort has focused on their impact on air quality. coal, oil, natural gas, and biomass). —Schnell et al. Seasons and times of day. Schnell et al. Schnell, Vaishali Naik, Larry W.

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EPA issues final approval for HFO-1234yf refrigerant for mobile AC systems

Green Car Congress

The chemical, which does not deplete the ozone layer, may now be used in air conditioning for new cars and light trucks. When used appropriately, EPA says, this chemical can reduce the environmental impact of motor vehicle air conditioners and has a global warming potential that is 99.7%

EPA 199
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Study Finds Controlling Soot May Be Fastest Method to Reduce Arctic Ice Loss and Global Warming; Second-Leading Cause of Global Warming After CO2

Green Car Congress

Controlling soot from fossil fuels and solid biofuels may be a faster method of reducing Arctic ice loss and global warming than other options, including controlling CH 4 or CO 2 , although all controls are needed, according to a new study by Dr. Mark Z. That ranks the effects of soot ahead of methane, an important greenhouse gas.

Global 230
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New international study finds lab testing of diesel NOx emissions underestimates real-world levels by up to 50%

Green Car Congress

Heavy-duty vehicles, such as commercial trucks and buses, were by far the largest contributor worldwide, accounting for 76% of the total excess gas emissions. For light-duty vehicles, such as passenger cars, trucks, and vans, the European Union produced nearly 70% of the excess diesel nitrogen oxide emissions. —Chris Malley.

Diesel 230