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Bangalore among top polluted mega cities

New Delhi, Nov 30 (): Bangalore, India’s ‘silicon valley’ has now emerged as one of the top polluted mega cities in the world, according to a new study that used data collected by NASA’s high-tech satellites.

A new research was done by Israeli scientists using data from three US satellites to study the world’s 189 largest cities, many of which had the population of more than 10 million. They analysed eight years’ worth data from three of NASA’s high-tech aerosol monitoring satellites, for 189 mega-cities, including Mumbai, Tokyo and New York City. Obviously, their method is the first to provide standardised global testing of pollution levels.

They mainly looked at the concentration of aerosol in the atmosphere, which functions as a probable indicator of the man-made pollution because these tiny particles are emitted from vehicles, burning of firewood, fossil fuel combustion in factories, cow dung cake and other biomass.

Central and North-East America and Europe are seeing the largest decreases in aerosol concentrations overall, the website said. Houston was ranked among the cleanest cities, with a 31 per cent decrease over the time period; Brazil, Curitiba with a 26 per cent decrease; and Sweden, Stockholm with a 23 per cent decrease.

North-East China, the Middle East, Central Africa and India are presently leading in the increase of pollution, including Bangalore, with a 34 per cent average increase in aerosol concentration between 2002 and 2010.

Some American cities are in the list of increased pollution levels, including Portland with a 53 per cent average increase and Seattle with a 32 per cent average increase.

With a 34 per cent average increase in atmospheric aerosol concentration between 2002 and 2010, Bangalore is among the worsening cities of the world. Pune, Nagpur and Hyderabad too fared badly.

Other Indian cities studied by Israeli researchers are Delhi, Mumbai, Kolkata, Chennai, Ahmedabad, Surat, Bhilai, Patna and Lucknow. All have significantly high aerosol levels in the atmosphere.