The World Health Organization updated its guidance on air pollution last year – and now it has concluded that 99 per cent of the world’s population is affected by the pollution’s harmful effects.
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India has nine of the world’s 10 cities with the worst air pollution caused by a tiny pollutant known as PM2.5. Ahmedabad tops the list, with Delhi in third, a new database published today by the WHO shows. For a larger but still harmful pollutant, PM10, the top 10 list of the dirtiest places is more diverse, including settlements in Bahrain, India, Iran, Iraq, Pakistan, South Africa and Saudi Arabia.
Low and middle-income countries are worst affected by harmful levels of particulate matter compared with the global average. For a third pollutant – nitrogen dioxide – the economic split is less clear and affluent countries are affected too.updated its guidelines for recommended air pollution limits for the three pollutants last September
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