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Comparative study finds that B20 increases emission rates of a number of pollutants in both light- and medium-duty diesel engines at idle

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They found that the level of emissions of regulated and unregulated pollutants in diesel exhaust depends on fuel, load, engine calibration, and exhaust aftertreatment technology. Unregulated pollutants also include ozone precursors and bioaccumulative and toxic compounds. L) and medium-duty (6.4 —Chin et al.

Pollution 231
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Study finds high exhaust temperatures within NTE operation for heavy-duty diesels with aftertreatment systems contribute to high nanoparticle concentrations

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The transient results illustrate the gradual formation of the nucleation mode particles with continuous increase in exhaust temperatures. The particle number count under those conditions increased by more than an order of magnitude in comparison to DPF-out particle concentrations. Credit: ACS, Thiruvengadam et al. Click to enlarge.

Exhaust 218
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ICL briefing paper estimates that 52% of all small particle pollution from road transport comes from tires and brakes

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A new briefing paper from Imperial College London estimates that in 2021, 52% of all small particle pollution from road transport came from tires and brakes. Despite this, research on the environmental and health impacts of tire wear has been neglected in comparison to the research and innovations dedicated to tackling fuel emissions.

Pollution 243
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Study found highly elevated PM2.5 in pre-COVID-19 subway air in NE US; NYC the worst

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Our findings add to evidence that subways expose millions of commuters and transit employees to air pollutants at levels known to pose serious health risks over time. By comparison, aboveground air concentrations for all measured cities averaged just 16 ?g/m g/m 3 ), followed by the MTA New York at 251 ?g/m

New York 418
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Shenzhen to issue only 100K new license plates per year in effort to combat congestion and pollution

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On 30 December, the city government of Shenzhen, China announced that it will only issue 100,000 license plates per year via lotteries and auctions, with immediate effect, to fight congestion and pollution. For comparison, New York City in 2013 had a population of 8.4 By the end of 2013, it had 10.63 million permanent residents.

Pollution 218
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Chalmers study finds ship exhaust gas scrubbers responsible for up to 9% of certain hazardous emissions into Baltic Sea

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New research from Chalmers University of Technology, Sweden, finds that the discharge water from ships’ exhaust gas treatment systems—i.e., Comparison of loads (kg/year) of PAHs from direct discharges from ships and atmospheric deposition to the Baltic Sea. Marine Pollution Bulletin , Volume 182, doi: 10.1016/j.marpolbul.2022.113904.

Exhaust 170
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Study finds use of high cetane fuel reduces all primary pollutants under advanced diesel combustion mode

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Comparison of optimized start of injection of advanced diesel combustion for brake thermal efficiency, NO x , PM, THC, and CO of diesel (open bar); HTFT (gray bar); and LTFT (black bar) fuels. Credit: ACS, Lilik and Boehman. Click to enlarge.

Diesel 236