After a mysterious and sharp increase between 2012 and 2017 that could be traced to eastern China global emissions of a potent (and banned) substance notorious for depleting the Earth's ozone layer - the protective barrier that absorbs the Sun's harmful UV rays - have fallen rapidly in recent years and are now as low as never before since measurements began in this region in 2008, according to new atmospheric analyses published in Nature today.
An international research team, including scientists from MIT, have observed a global reduction of the banned ozone-depleting chemical CFC-11, after it spiked unexpectedly several years ago.
Dramatic decreases in traffic caused by COVID-19 shutdowns improved air quality in car-dependent states but didn't offset additional forms of pollution in other parts of the country.
Global emissions of a potent substance notorious for depleting the Earth's ozone layer -- the protective barrier which absorbs the Sun's harmful UV rays -- have fallen rapidly and are now back on the decline, according to new research.
Molecular iodine, a major emission from the ocean, can quickly convert to iodic oxoacids even under weak daylight conditions. These oxoacids lead rapidly to aerosol particles that significantly affect climate and human health.
In Africa, air pollution recently surpassed AIDS as the leading cause of premature death. But researchers have discovered at least a temporary bright spot: dangerous nitrogen oxides, byproducts of combustion, are declining across the north equatorial part of the continent. The reason: a decline in the longtime practice of setting of dry-season fires to manage land.
Professor Ding Aijun explored global air-quality changes during COVID-19 lockdowns and regional disparities in O3 responses to emission reductions. They integrated multiple observational datasets, including global air quality monitoring network and satellite retrievals, to shed more light on the regional differences in interactions between emissions, atmospheric chemistry, and meteorological conditions.
As part of a worldwide collaboration, Carnegie Mellon University chemists have helped discover that iodic acids can rapidly form aerosol particles in the atmosphere, giving scientists more knowledge of how iodine emissions can contribute to cloud formation and climate change.
To arrive at Nunavut, turn left at the Dakotas and head north. You can't miss it--the vast tundra territory covers almost a million square miles of northern Canada. Relatively few people call this lake-scattered landscape home, but the region plays a crucial role in understanding global climate change.
The 2011 nuclear disaster at Fukushima, Japan caused a great amount of radioactive cesium to spread to nearby forests. Now, in a chapter in the latest technical document of the International Atomic Energy Agency, researchers from Japan, in collaboration with experts in Europe, explore the dynamic flow of these radionuclides in forest ecosystems. Their compilation of data and analyses on radiocesium dynamics will help us develop better forest remediation strategies.