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Texas study finds PHEV use could increase ozone at night, decrease ozone during the day

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A study by researchers at the University of Texas found that in general, use of plug-in hybrid electric vehicles (PHEVs) can lead to an increase in ozone during nighttime hours (due to decreased scavenging from both vehicles and EGU stacks) and a decrease in ozone during daytime hours. The results are less clear in Dallas and Houston.

Ozone 218
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HALO research aircraft measuring the emissions of megacities in EmeRGe project

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However, emissions do not just remain in conurbations; particles and gaseous pollutants can be transported thousands of kilometers by the wind. The transport and transformation of plumes from selected European and Asian major population centers (MPCs) will now be investigated with special focus on the rate of formation of ozone and aerosols.

Emissions 268
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New international study finds lab testing of diesel NOx emissions underestimates real-world levels by up to 50%

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A new international study has found that laboratory tests of nitrogen oxide emissions from diesel vehicles significantly underestimate the real-world emissions by as much as 50%. Real-world NO x emission factors by vehicle emissions standard in key regions. A paper on the work is published in the journal Nature.

Diesel 230
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MECA report finds additional NOx emission reductions from new heavy-duty trucks achievable and cost-effective

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The transportation sector was responsible for over 7 million tons of NO x emissions in the US in 2014, with 50% of this sector’s NO x attributed to heavy-duty on- and off-road vehicles and equipment. NO x is a precursor for both ground level ozone and secondary PM 2.5 Source of data: US EPA (2019). Chart: MECA.

Emissions 291
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Northwestern/Princeton study explores air quality impacts of aggressive conversion to EVs

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In a paper published in the journal Atmospheric Environment , they report on the findings from a suite of scenarios designed to quantify the effect of both the magnitude of EV market penetration and the source of electricity generation used to power them. coal, oil, natural gas, and biomass). —Schnell et al. Seasons and times of day.

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EPA report to Congress finds a strong scientific and technical foundation for mitigating black carbon emissions

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positive or negative—and magnitude of net climate forcing from BC emissions), currently available scientific and technical information provides a strong foundation for making mitigation decisions to achieve lasting benefits for public health, the environment, and climate. emissions in 2005. Earlier post.). Source: EPA.

Congress 252
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New Comprehensive Lifecycle Energy and Emissions Inventory Includes Non-Operational Components; Large Aircraft Can Perform Better than Light Rail

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Energy consumption and GHG emissions per PKT (passenger kilometer travelled). Inventorying criteria air pollutants showed that vehicle non-operational components often dominate total emissions. Life-cycle criteria air pollutant emissions are between 1.1 The vehicle operation components are shown with gray patterns.

Light 150