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A study suggests that as forests change, higher levels of nitrogen oxides are to be expected, making it more difficult for some regions to meet national air quality standards.
Diwali, the festival of lights, is celebrated over three days. But in recent years, the fireworks have caused controversy in some parts of India.
Poland's prime minister says the government intends to spend up to $8.8bn by 2028 on cleaner heating as it takes effort to fight smog.
Political apathy over the poisonous smog choking India's capital has led many like businessman Kamal Meattle to take matters into their own hands, with an office building he says pumps air as fresh as from the Swiss Alps.
Tens of thousands of runners braved smoggy conditions for the Delhi half-marathon on Sunday despite dire health warnings from doctors who wanted the race postponed in the heavily polluted Indian capital.
The dreadful event over 60 years ago might be linked to many new cases of asthma. It might have significant implications for cities that currently have high levels of air pollution.
A World Health Organisation study has ranked New Delhi as the world's worst city for air pollution, but Indian officials disagree.
A Beijing man wants a divorce because the city's smog problem forced his wife to take their son away to a tropical island.
India's mega Hindu festival begins under cloud of toxic air, a sign that government officials are struggling to grapple with the country's worsening air pollution.
Yogesh Kumar wheezes after life-saving surgery to remove a diseased lung, but his doctors wonder how long he can last outside hospital breathing some of the world's dirtiest air.
First major pollution event of the winter takes hold in China’s capital.
Air quality in China's notoriously smog-ridden capital in 2017 was the best since pollution control measures were implemented five years ago, the Beijing government announces.
Chinese cities are limiting the number of cars on roads and have temporarily shut down factories to cut down pollution during a national "red alert" for smog.
The Chinese government is planning to phase out six-million cars registered before 2005 in an effort to reduce the high levels of smog across its major cities.
Air pollution killed about 7 million people in 2012, making it the world's single biggest environmental health risk, and New Delhi has the dirtiest air in the world.
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