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Studies find global COVID-19 lockdowns have significantly reduced PM2.5 and NO2 pollution, but ozone up

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Levels of two major air pollutants have been reduced significantly since lockdowns began in response to the COVID-19 pandemic, but a secondary pollutant—ground-level ozone—has increased in China, according to new research. For comparison, columns over the same time periods are shown for 2019. —Jenny Stavrakou.

Ozone 291
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Study finds rising temperatures increase risk of unhealthy ozone levels absent sharp cuts in precursors

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Ozone pollution across the continental United States will become far more difficult to keep in check as temperatures rise, according to new work led by the National Center for Atmospheric Research (NCAR). Scenario A2 and RCP 8.5. The RCPs were chosen to represent a broad range of climate outcomes, based on a literature review. The RCP 8.5

Ozone 199
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Researchers suggest that air quality tests need simplifying to help reduce dangerous emissions

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New methods of testing and simulating air quality should be considered in order to help policy makers have a more accurate understanding of how emissions affect air pollution levels, new research suggests. The researchers compared current techniques used to describe atmospheric chemical reactions against more historical techniques.

Emissions 170
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Toyota Central R&D Labs develops new ferrihydrite material that effectively removes ozone from air

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Comparison of O 3. Japan) report in the journal Angewandte Chemie the development of a mesoporous two-line ferrihydrite (2LFh)—ferrihydrite is a widespread mineral composed of iron, oxygen, and water—that could lead to a new generation of ozone filters in electrostatic devices and aircraft applications. Mathew et al.

Ozone 218
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PSI team develops web tool for consumers to compare environmental impact of passenger cars in detail

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The entire life cycle of the passenger cars is taken into account, including the manufacture of the vehicles and the environmentally relevant emissions from driving. Deterioration of the ozone layer [kg CFC-11-eq.]. Noise emissions [Person-Pascal/second]. Sample results from Carculator. Depletion of fresh water reserves [m 3 ].

Mariner 435
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NOAA, partners find about 98% decline in VOCs concentrations in LA Basin over last 50 years despite 3x increase in use of gasoline and diesel

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VOCs, primarily emitted from the tailpipes of vehicles, are a key ingredient in the formation of ground-level ozone which, at high levels, can harm people’s lungs and damage crops and other plants. This indicates that the main VOC source in the LA basin is likely gasoline vehicle emission. —lead author Carsten Warneke, Ph.D.,

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ICCT finds growth in shipping in Arctic could increase pollutant emissions 150-600% by 2025 with current fuels

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Comparison of the potential reduction in emissions with the application of lower sulfur 0.5% While that report projected vessel activity, it did not explore the environmental impacts of increased shipping in terms of air emissions or the potential climate impacts from increases in short-lived climate pollutants such as black carbon.

Pollution 150