Both air pollution and global warming could be reduced by controlling emissions of methane gas, according to a new study by scientists at Harvard University, the Argonne National Laboratory, and the Environmental Protection Agency. The reason, they say, is that methane is directly linked to the production of ozone in the troposphere, the lowest part of Earths atmosphere, extending from the surface to around 12 kilometers [7 miles] altitude. Ozone is the primary constituent of smog and both methane and ozone are significant greenhouse gases.
A simulation based upon emissions projections by the Intergovernmental Panel on Climate Change (IPCC) predicts a longer and more intense ozone season in the United States by 2030, despite domestic emission reductions, the researchers note. Mitigation should therefore be considered on a global scale, the researchers say, and must take into account a rising global background level of ozone. Currently, the U.S. standard is based upon 84 parts per billion by volume of ozone, not to be exceeded more than three times per year, a standard that is not currently met nationwide. In Europe, the standard is much stricter, 55-65 parts of ozone per billion by volume, but these targets are also exceeded in many European countries.
Writing this month in the journal Geophysical Research Letters, Arlene M. Fiore and her colleagues say that one way to simultaneously decrease ozone pollution and greenhouse warming is to reduce methane emissions. Ozone is formed in the troposphere by chemical reactions involving methane, other organic compounds, and carbon monoxide, in the presence of nitrogen oxides and sunlight. Methane is known to be a major source of ozone throughout the troposphere, but is not usually considered to play a key role in the production of ozone smog in surface air, because of its long lifetime.
Harvey Leifert | EurekAlert!
Road access for all would be costly, but not so much for the climate
10.07.2020 | Potsdam-Institut für Klimafolgenforschung
Innovative grilling technique improves air quality
01.07.2020 | Fraunhofer Institute for Building Physics IBP
New insight into the spin behavior in an exotic state of matter puts us closer to next-generation spintronic devices
Aside from the deep understanding of the natural world that quantum physics theory offers, scientists worldwide are working tirelessly to bring forth a...
Kiel physics team observed extremely fast electronic changes in real time in a special material class
In physics, they are currently the subject of intensive research; in electronics, they could enable completely new functions. So-called topological materials...
Solar cells based on perovskite compounds could soon make electricity generation from sunlight even more efficient and cheaper. The laboratory efficiency of these perovskite solar cells already exceeds that of the well-known silicon solar cells. An international team led by Stefan Weber from the Max Planck Institute for Polymer Research (MPI-P) in Mainz has found microscopic structures in perovskite crystals that can guide the charge transport in the solar cell. Clever alignment of these "electron highways" could make perovskite solar cells even more powerful.
Solar cells convert sunlight into electricity. During this process, the electrons of the material inside the cell absorb the energy of the light....
Empa researchers have succeeded in applying aerogels to microelectronics: Aerogels based on cellulose nanofibers can effectively shield electromagnetic radiation over a wide frequency range – and they are unrivalled in terms of weight.
Electric motors and electronic devices generate electromagnetic fields that sometimes have to be shielded in order not to affect neighboring electronic...
A promising operating mode for the plasma of a future power plant has been developed at the ASDEX Upgrade fusion device at Max Planck Institute for Plasma...
07.07.2020 | Event News
02.07.2020 | Event News
19.05.2020 | Event News
10.07.2020 | Life Sciences
10.07.2020 | Materials Sciences
10.07.2020 | Life Sciences