‘Toxic Cocktail’ Makes Delhi Most Polluted City

‘Toxic Cocktail’ Makes Delhi Most Polluted City‘Toxic Cocktail’ Makes Delhi Most Polluted City

Delhi, the world’s most polluted city, suffers a toxic blend of geography, growth, poor energy sources and unfavorable weather that boosts its dangerously high levels of air pollution, scientists have found.

A team of researchers led by the University of Surrey in UK assessed how Delhi’s landscape, weather, energy consumption culture, and growing urban population combines to elevate concentrations of air pollutants, including ultra-fine particles, the most harmful to human health, reports PTI.

“Air pollution has been placed in the top ten health risks faced by human beings globally. The Indian capital has the dubious accolade of being regularly cited as the most polluted city in the world, with air pollution causing thousands of excess deaths in a year in this growing megacity,” said Dr Prashant Kumar of the University of Surrey.

“While it might be easy to blame this on increased use of vehicles, industrial production or a growing population, the truth is that Delhi is a toxic pollutant punchbowl with myriad ingredients, all which need addressing,” he said.

Delhi is classed as the world’s fifth ‘megacity’ and has a population of 25.8 million.

With this growth, the study predicted that the number of road vehicles will increase from 4.7 million in 2010 to nearly 26 million by 2030. Total energy consumption has risen 57% from 2001 to 2011, researchers said.

As a landlocked megacity, Delhi has limited avenues for flushing out polluted air and its surrounding regions are sometimes even more polluted than the city.

For example, most of the brick kilns used for making bricks are not located in the city, but in predominantly upwind surrounding industrial areas, researchers said.

These outside pollutants can be attributed to use of low-quality fuels such as raw wood, agricultural and plastic waste in industrial settings, cow dung for cooking stoves and widespread use of diesel generators due to unreliable infrastructure.

These sources release fine particle pollutants, the most dangerous to human health. Coupled with Delhi’s densely packed architecture and varying building heights the ‘breathability’ of the city is inhibited by its weather conditions.

According to a World Health Organization (WHO) report released in May last year, Delhi was ranked as the most polluted city in the world.

Its air has PM2.5 concentrations of 153 micrograms and PM10 concentrations of 286 micrograms - much more than the permissible limits, WHO said.The study was published in the journal Atmospheric Environment.