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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. Ozone is harmful to humans at ground-level, causing pulmonary and heart disease. —Guy Brasseur.

Ozone 291
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Harvard/Nanjing study: China’s war on PM2.5 pollution is causing more severe ozone pollution

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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.

Ozone 262
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Satellite method provides insight into ozone-NOx-VOCs sensitivity for different locations

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Ozone pollution near Earth’s surface is one of the main ingredients of summertime smog. It is also not directly measurable from space due to the abundance of ozone higher in the atmosphere, which obscures measurements of surface ozone. —Jin et al.

Ozone 150
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California 2017 GHG inventory shows 1.2% total drop from 2016; transportation sector emissions up 1%

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In 2017, emissions from GHG emitting activities statewide were 424 million metric tons of CO 2 equivalent (MMTCO 2 e), 5 MMTCO 2 e lower than 2016 levels and 7 MMTCO 2 e below the 2020 GHG Limit of 431 MMTCO 2 e. Changes in emissions by Scoping Plan sector between 2000 and 2017. MMTCO 2 e (6%) from 2013 to 2017. Source: ARB.

2017 230
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CARB fines Del Monte $2M for violations of OGV at Berth regulation

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It requires anyone who owns, operates, charters, rents or leases any US or foreign-flagged container, passenger or refrigerated-cargo vessel that visits a California port to meet the operational time limits and reduce their power generation fleet-wide, as well as submit statements of compliance.

Ozone 321
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Study of 60M US seniors strengthens link between air pollution and premature death

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and of 10 ppb in ozone were associated with increases in all-cause mortality of 7.3% (95% confidence interval [CI], 7.1 of less than 12 μg per cubic meter and ozone of less than 50 ppb, the same increases in PM 2.5 and ozone were associated with increases in the risk of death of 13.6% (95% CI, 13.1 and 1.1% (95% CI, 1.0

Pollution 265
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EEA report finds most Europeans in cities still exposed to levels of air pollution exceeding WHO guidelines

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The new EEA analysis is based on the latest official air quality data from more than 4,000 monitoring stations across Europe in 2017. Among the findings: Concentrations of particulate matter (PM) continued to exceed the EU limit values and the WHO AQGs in large parts of Europe in 2017. For PM with a diameter of 10 ?m

Pollution 170