Air pollution ‘worsens’ winter smog in South Asia
London: Rapid rise in air pollution from fossil fuels and biomass burning has worsened winter smog and extended its duration in many parts of South Asia including India, scientists and officials have said.
According to experts, the temperature has plummeted and clouds of fog and smoke hang in the sky blocking sunlight for several days in Bangladesh, India and Nepal.
Normal lives have been affected with many flights diverted and suspended and trains delayed because of low visibility.
Experts have also said they have noticed that the intensity of smog has grown in the Indo-Gangetic plains in the last few years, leading to increased impacts.
“Since 1990 onwards, there has been increase in the number of smog-affected days in northern India,” the BBC quoted BP Yadav, director of the Indian Meteorological Department as saying.
“It is not a linear trend showing an increase every year. There are, of course, year-to-year fluctuations.
“But there are more years that have seen dense fogs,” he said.
India, like Bangladesh, sees lots of constructions during winter as this is the dry season before the region gets monsoon rainfall preventing such works.
“Construction works too are major contributors for the smog in this season as they lead to more pollution in the air,” Yadav said.
In its World Energy Outlook 2010, the International Energy Agency said that “India is the second-largest contributor to the increase in global energy demand to 2035, accounting for 18 percent of the rise.”
Scientists say pollutants and aerosols in the air enhance condensation of water in the atmosphere causing dense smog.
“The more pollutants in the air, the denser the smog,” Keshav Prasad Sharma from Nepal’s Department of Hydrology and Meteorology, said.
“In some Nepal-India bordering areas, smog blankets can be seen from early evening,” he said.
When such blankets of smog block sunlight, sending temperatures down, people make fire from wood, cow-dung cake and hay to warm themselves and that creates more air pollution that leads to denser smog.
Scientists say the real trouble is that smog during winter cannot escape to the upper atmosphere as it can during other seasons, because of meteorological conditions.
“During winter, the cold air that blows towards the southwest from the northeast tends to push the boundary layer the layer of atmosphere closest to the Earth surface low,” William Lau, deputy director for atmospheres at NASA’s Goddard Space Flight Center, said.
“As a result, all the pollutants get trapped in the boundary layer that is pushed down to as low as one kilometre from the Earth’s surface while it is more than five kilometres away during other seasons.
“The cold wave becomes severe because of this local trapping of the aerosols and other pollution that block off the solar radiation and create very unhealthy air in this part of the world,” he added.
More from India
More from World
More from Sports
More from Entertaiment
- IAF Mirage fighter plane lands on Yamuna Expressway!
- Kejriwal accuses Centre of trying to rule Delhi through LG
- 'Maggi' under regulatory scanner for excess amount of lead, MSG
- Watch: Michelle Obama's 'Gimme Five' fitness video
- When Subramanian Swamy shocked people at a wedding!
- Expect that Rahul will be Congress president in 2015: Jairam Ramesh
- Mumbaikars join hands to save Pakistani teen with rare illness
- DNA: Analysis of Hurriyat chief Syed Geelani's passport issue
- DNA: Analysis of traffic system of Vancouver, Canada
- Mumbai: Diamond export company denies job to Muslim youth
- Aapke Sitare: Astro prediction for May 21, 2015
- Mirage 2000 fighter jet landing was part of capability demonstration: IAF
- DNA: IAF Mirage 2000 fighter plane lands successfully on Yamuna expressway
- DNA: Osama documents show 'Indian brother in Madinah' financed al Qaeda
- PM Modi's key campaign team member may join Nitish Kumar
- RBSE (rajresults.nic.in) Class 12th science and commerce results 2015: Rajasthan Board Class 12th XII exam results 2015 expected to be announced on May 21
- RBSE (rajresults.nic.in) Class 12th science and commerce results 2015: Rajasthan Board Class 12th XII exam results 2015 to be announced today at 4 PM
- JAC 12th Inter Arts Result 2015: JAC 12th Inter Arts Result 2015 (jharkhandeducation.net) likely to be announced on Thursday May 21 at 1 PM
- CBSE Class 10 Results 2015 to be announced today?
- IAF jet lands on Yamuna expressway
- Check Jharkhand Board jac.nic.in: Class 12th Art Results 2015 declared
- Andhra Pradesh EAMCET results 2015: Andhra Pradesh EAMCET results to be announced on May 21 at www.apeamcet.org
- Log on to apeamcet.org AP EAMCET Results 2015: Andhra Pradesh EAMCET Marks and AP EAMCET Ranks 2015 declared
- Fawad Khan doesn’t want intimate scenes with Sonam Kapoor?
- We hire only non-Muslim candidates, diamond export firm tells Muslim youth
- IPL 2015: Rajasthan Royals vs Royal Challengers Bangalore - As it happened...
- DHSE (dhsekerala.gov.in) 12th Result 2015: Kerala DHSE Class 12th XII exam results 2015 to be announced on May 21
- Is MSG in 'Maggi' noodles harmful for you?
- SSLC (tnresults.nic.in) Tenth 10th Results 2015: Tamil Nadu Board Class 10th X Higher Secondary exam results 2015 to be declared on May 21
- 'IAS officer DK Ravi possibly committed suicide, suffered big loss in real estate business'