Paris has leapt into the headlines over an alert for dangerous atmospheric particles, yet it does not ordinarily count among the world’s most polluted cities.
Here are the top 10 cities for which data is available, according to a 2011 World Health Organisation (WHO) report. The pollution is measured as the microgramme (mcg) concentration per cubic metre of air of particulate matter smaller than 10 micrometres (PM10) — about a seventh of the width of a human hair. The figures are the average for the year. Seasonal spikes can be many times higher. The WHO’s health guidelines Read More »Lahore, Peshawar, Quetta among world’s Top 10 polluted cities