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May 26, 2022

Coronavirus / Russia-Ukraine

Near future

News to understand, anticipate, improve the future.

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News to understand, anticipate, improve the future.

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Cleaner air for coronavirus opens a window to a car-free future

The blockade of world transport has allowed researchers to do the largest ever study on smog: it will help us to draw a future without a car.

Gianluca Ricciodi Gianluca Riccio
in Environment
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car-free future
May 7, 2020
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THENational oceanic and atmospheric administration (NOAA) is a US federal agency dealing with oceanography, meteorology and climatology. NOAA used its air, sea and satellite resources to develop a global picture of the sharp reductions in greenhouse gases and other pollutants created by the behavioral changes caused by the coronavirus.

In what the agency hopes will be the first major study of what the world could expect from a future fleet of cleaner electric vehicles and lower emissions from aircraft and industries, NOAA was quick to put together various experiments to measure change. caused by the near-global lockdown in April. The result is almost a photograph of a future without a car.

Craig McLean, assistant administrator of NOAA, says, "Our past work has prepared us to investigate these times in an unprecedented way." "This unique view of the relative stillness in which we find ourselves will be measured against the main knowledge NOAA has built up over decades of data collection." And it will help us to promote a different mobility, a future without polluting cars.

Two families of bad substances

The experiments are probing the differences between the lockdown areas and those left open. Jessica Gilman, a research chemist at NOAA's chemical science laboratory, explored the sharp decline in some substances in urban smog called "volatile organic compounds", many of which can cause health problems. One of the main sources is the tailpipe of vehicles.

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On the other side of the scale, another family of compounds was put under observation. Volatile chemicals, which come from the use of cleaning products, disinfectants and personal care products (such as face creams). Chances are they stayed the same or went up.

Smog "cooks" in the sun and becomes unpredictable

Both families of substances mix in urban smog and create new chemicals that are difficult to predict. In this case where traffic has collapsed but the use of chemicals, probably driven by cleaning products, has increased. “It's a non-linear effect,” Gilman explained. The example is that of a dish containing sugar, water and flour: precise ingredients, which are cooked together. When these ingredients are cooked together, their different dosages can result in a huge variety of products, some unpredictable.

The "cooking" in this case takes place when the smog is "cooked" by sunlight. One of the answers Gilman and other scientists hope to get from the study is an accurate picture of what smog might look like in a future without polluting cars, where cleaner electric vehicles dominate the streets.

Another result of the study is an increased ability to detect tiny particle aerosols emitted by vehicles. The so-called PM2.5, which an increasing number of medical tests define as a serious health threat. It may also have aggravated deaths and diseases associated with Covid-19. For aerosols, NOAA has been able to exploit at least 10 satellites from the United States, Europe and Japan to measure atmospheric composition in various parts of the world.

We will learn a lot

Once the data is entered, scientists will have a better understanding of many other factors. For example, the effects of the reduction of flights by airlines. Or whether the relative and rare absence of contrails from passenger jets caused changes in cloud formations. They will also be able to assess whether these changes may have affected the amount of sunlight reaching Earth.

Most of all, you can tell us sooner than expected how much better we will be without the smog of fossil fuel cars.

tags: electric carpollutionsmog
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