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Perhaps you also believe that summer air quality is worse because of the longer days and ultraviolet radiation. The stable weather means that, without a storm, city air can seem stagnant and airless.
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In winter, a confluence of natural phenomena exacerbates air pollution. Overcast weather, in particular, tends to trap the pollution beneath the cloud. In this kind of temperature inversion, the warm air acts as a lid, covering air pollutants.
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1. Surface inversion 2. Subsidence inversion 3. Frontal inversion
1. Puma Te-Ku SaT ( 366681 03 ), During cold winter nights, the earth surface loses temperature very fast. The air close to the surface gets cooler faster than the air above it. This is how the warmer layer of air, above the colder one, comes to be formed.
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Urgent action is clearly required in Delhi to curb congestion, primarily by encouraging public transport. Experts reckon that the city needs between 12,000 and 15,000 buses but its current fleet numbers just 5,000. Polluting vehicles also need to be taxed more heavily.
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Sadly, European cities offer little respite. Last year, Paris suffered its worst, and longest, winter for a decade. The authorities in the French capital, in a bid to combat the problem, imposed a so-called half traffic measure whereby vehicles with odd number plates were allowed into the city on alternate days.
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If it’s any consolation to Brits, things used to be even worse. Aficionados of old movies depicting Victorian London will be familiar with the look of the aptly named ‘Big Smoke’ in winter. It’s amazing that Jack the Ripper could see who he was strangling since city dwellers could barely see barely more than a few metres ahead!
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Our love affair with the motor car has continued despite it contributing to alarming levels of pollution. Moreover, a study by the American Journal of Respiratory and Critical Care Medicine has shown that smog in Europe and North America could be more than 25 times more lethal than the average air pollution in Chinese cities.
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Environmentally-friendly measures are sorely needed. Recently, Italy’s economic minister confirmed that his country is committed to phasing out coal towards complete cessation by 2025. Italy now joins France, the UK, and Canada in pledging to end coal-burning. A step, at least, in the right direction.
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Areeba Hamid, an air pollution campaigner with environmental group Greenpeace, has especially sharp words for car manufacturers. “We now know fumes from diesel vehicles are a lot more toxic than car companies claimed and this is a big cause of air pollution in Europe and North America.”
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Without more orchestrated government action – like that imposed by the Chinese authorities – we can only rely on individuals making sensible lifestyle choices. And that means the sight of urban commuters spluttering their way through the winter is unlikely to disappear.
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