How the pollution fight unites Delhi, Beijing and Zabol
GLOBAL TROUBLE As unfavourable weather conditions make air quality worse, India has been slow to fight back
pollutants from stubble burning regions of Punjab and Haryana, pushed up the pollution levels in Delhi,” said Gufran Beig, project director of the System of Air Quality And Weather Forecasting And Research (SAFAR), a government agency linked with the ministry of earth sciences.
But, beyond the man-made, Delhi’s pollution is also the result of a quirk of nature – something that the residents of Beijing and Zabol know a thing or two about.
Every year, ahead of the onset of winter, Delhi’s air quality worsens because cooler surface air traps pollutants closer to the ground. In the absence of ground winds, these pollutants from construction activities fail to disperse into the atmosphere, a phenomenon known as inversion.
When high altitude winds bring in clouds of smoke from burning stubble farms in Punjab and Haryana, the entire city is trapped in a bubble of noxious air.
“While emissions from various sources had already pushed up the national Capital’s pollution level to the ‘very poor’ cate- gory since October, unfavourable meteorological conditions aggravated the situation,” A Sudhakar, member secretary of the Central Pollution Control Board, said. “This has resulted in a drastic rise in pollution levels as the city has become like a chamber with almost no outlets.”
This is a problem that the residents of Zabol, an eastern Iranian city, face every year. During summer, dust storms rage, bringing in pollutants from neighbouring Afghanistan and Pakistan. The city can experience up to 80 dust storms in a year that bring in loads of dust from neighbouring countries. The only way to fight back is to distribute anti-pollution masks to all its residents.
Beijing also suffers from similar problems. What crop-burning is to Delhi, the so-called “industrial rust belt” is to Beijing. There are thousands of factories around the Chinese capital and in its six neighbouring provinces and regions Tianjin, Hebei, Henan, Shanxi, Shandong and Inner Mongolia.
“Wind patterns or air mass movements are an important reason (for pollution accumulation.) The current Delhi pollution is happening because of transfer of pollution from crop burning areas. Beijing pollution is from industrial rust belt areas,” said Lauri Myllyvirta, a Beijing-based energy analyst with environmental advocacy group Greenpeace.
In 2016, the World Health Organisation named Zabol the world’s most polluted city based on the level of PM2.5 – the ultrafine particles which sticks deep inside the lungs and takes the heaviest toll on human health. While Delhi ranked 11th, Beijing ranked 57th on the list.
While crop burning and weak winds make Delhi’s air bad in the colder months, the city’s topography contributes to particulate aerosol in summers that are marked by strong winds.
“Delhi has a variety of soil. The soil has degraded in several areas because of construction and development. They become loose, and get blown by wind easily. This adds to air pollution,” said CR Babu who heads the Centre for Environmental Management of Degraded Ecosystems at University of Delhi .
In summer, dust is also brought in to Delhi by storms from the north-west. These winds, western disturbances as they are called, pick up dust in large amounts from the desertlike north-western India and even west Asian and sub-saharan countries.
To counter pollution, China and India have various measures in place. China has introduced a
PM 2.5 level PM 10 level (PM levels in microgram per cubic metre)
World ranking as per PM2.5 and PM10 is worst to best
four-tier colour-coded system for air pollution, with red being the most serious, followed by orange, yellow and blue.
Delhi has woken up late but now has its Graded Response Action Plan – an emergency measure based on various categories of pollution, which is being implemented for the first time.
In China, the number of heavy pollution days (when the AQI is
higher than 100) has dropped from 58 days in 2013 to 39 days in 2016. In Delhi, proper implementation will be needed to reverse the trend.
But the only long-term solution, experts say, is to cut down on burning fossil fuels. In China, for example, progress on air pollution control stalled in the region after a stimulus push started by the government in early 2016,
leading to a temporary increase in output and prices of steel, cement and other products from highly polluting industries.
The plan now is to gradually curb polluting industries to begin with. It’s also said to be considering curbing the use of vehicles that use fossil fuels to amplify the fight against weather conditions by controlling man-made sources.