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New Delhi is once again the most polluted city on Earth
Temples and buildings shrouded in smog in New Delhi, India, on November 6, 2018.
Nasir Kachroo/NurPhoto via Getty Images
New Delhi, India’s sprawling capital region home to 18.9 million people, is once again home to the worst air pollution in the world.
With the Hindu festival of lights Diwali in full swing this week, New Delhi residents celebrated with fireworks, lamps, firecrackers, and bottle rockets that sent smoke and ash through the chronically congested metropolis.
India’s Supreme Court tried to get ahead of the commotion with a ban on most types of fireworks, allowing only “green crackers” that produce limited noise and smoke, and only for a narrow time slot. But Delhiites were defiant, setting off all kinds of fireworks for hours.
Several Air Quality Index monitors maxed out on Wednesday with a reading of 999. That’s almost double the upper limit of what’s considered hazardous. Of particular concern is small particles that are less than 2.5 microns in diameter known as PM 2.5.
These particles penetrate deep into the lungs and can lead to a variety of health problemsranging from asthma attacks, high blood pressure, and, over the long-term, cancer.
In New Delhi this week, PM 2.5 was so dense that it was like smoking 20 cigarettes in a day. And all across India, particulate pollution surged dramatically during and after Diwali celebrations.
But it’s not just the fireworks. New Delhi’s air pollution regularly surges in the colder months. That’s because the region’s geography acts as a basin that traps dirty air over the city. And when the weather cools, the wind slows down, allowing the air to stagnate.
About one-third of the pollution choking New Delhi right now doesn’t actually come from the city itself, but from farming regions on its outskirts. Farmers often burn crop stubble after the rice harvest to clear their fields and restore soil nutrients.
The smoke ends up wafting over New Delhi where it blends with urban pollution sources — cookstoves, heating fires, cars, and construction. As temperatures drop, many of the city’s impoverished people burn fires to keep warm while the more wealthy switch on heaters, increasing energy demand from coal-fired power plants.
FULL ARTICLE: https://www.vox.com/energy-and-environment/2018/11/8/18075340/delhi-pollution-diwali-india
Temples and buildings shrouded in smog in New Delhi, India, on November 6, 2018.
Nasir Kachroo/NurPhoto via Getty Images
New Delhi, India’s sprawling capital region home to 18.9 million people, is once again home to the worst air pollution in the world.
With the Hindu festival of lights Diwali in full swing this week, New Delhi residents celebrated with fireworks, lamps, firecrackers, and bottle rockets that sent smoke and ash through the chronically congested metropolis.
India’s Supreme Court tried to get ahead of the commotion with a ban on most types of fireworks, allowing only “green crackers” that produce limited noise and smoke, and only for a narrow time slot. But Delhiites were defiant, setting off all kinds of fireworks for hours.
Several Air Quality Index monitors maxed out on Wednesday with a reading of 999. That’s almost double the upper limit of what’s considered hazardous. Of particular concern is small particles that are less than 2.5 microns in diameter known as PM 2.5.
These particles penetrate deep into the lungs and can lead to a variety of health problemsranging from asthma attacks, high blood pressure, and, over the long-term, cancer.
In New Delhi this week, PM 2.5 was so dense that it was like smoking 20 cigarettes in a day. And all across India, particulate pollution surged dramatically during and after Diwali celebrations.
But it’s not just the fireworks. New Delhi’s air pollution regularly surges in the colder months. That’s because the region’s geography acts as a basin that traps dirty air over the city. And when the weather cools, the wind slows down, allowing the air to stagnate.
About one-third of the pollution choking New Delhi right now doesn’t actually come from the city itself, but from farming regions on its outskirts. Farmers often burn crop stubble after the rice harvest to clear their fields and restore soil nutrients.
The smoke ends up wafting over New Delhi where it blends with urban pollution sources — cookstoves, heating fires, cars, and construction. As temperatures drop, many of the city’s impoverished people burn fires to keep warm while the more wealthy switch on heaters, increasing energy demand from coal-fired power plants.
FULL ARTICLE: https://www.vox.com/energy-and-environment/2018/11/8/18075340/delhi-pollution-diwali-india