the most pollutes cities are all very large cities with many people living and working in them . power stations and industries burn coal . How do these factors affect pollution in these cities
Answers
That’s more than HIV, malaria and influenza combined – yet the sparse coverage of official data means many cities are not even monitored
Outdoor air pollution kills 3.3 million people, mostly in cities, every year.
Wed 2 Dec 2015 07.30 GMT
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Every day, hundreds of millions of people step outside into an environment that has become unsafe for human survival. Outdoor air pollution kills 3.3 million people every year, mostly in cities; more than HIV, malaria and influenza combined. But the search for this insidious mass killer reveals something astonishing. As the governments of more than 190 nations gather in Paris to discuss a possible new global agreement on climate change, not only don’t we know where it kills the most, in many places we aren’t even looking.
As November’s cold winds sweep down from Mongolia, the coal burning season begins in northern China. At the time of publication, Chinese maps on the World Air Quality Index website were awash with red, purple and maroon flags, indicating dangerous levels of fine particulate matter (PM2.5) – the world’s primary air pollutant.
It is thought that as many as 1.6 million Chinese are killed by breathing bad air every year. Beijing, in particular, is synonymous with the problem. Last weekend, the US embassy there reported the level of PM2.5 at 391 micrograms per cubic meter (µg/m3) and China’s environmental protection agency recommended residents stay indoors. And yet, the most definitive database of PM2.5 pollution, produced by the World Health Organization (WHO) earlier this year, places only one Chinese city, Lanzhou, in the worst 50.
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Answer:
because the smoke of the factory and oil from them will pollute air and in space the earth have one protection layer to protect from sun light and we are doing pollution coming from vehicles is damaging that protection to earth and some countries the sun rays is directly attaking to that particular area