This is meant to limit emissions of particulate matter and nitrogen oxide (NOx), known to cause respiratory disease, after Volkswagen in 2015 admitted to cheating US exhaust tests.
A majority of the 193 million population has access only to severely polluted water. Every year over 50,000 children die of diarrhoea.
The Indian Medical Association urged the city's biggest running race to be called off to protect runners and volunteers from exposure to high levels of deadly particulate matter that lodge deep in the lungs.
Authorities have ordered a ban on all construction work and barred lorries from entering the city as public pressure on the government mounts.
As public outrage mounted in the world's most polluted capital, the Delhi government ordered the closure of all primary schools on Wednesday.
Known in Mongolia as the "dark blue pearl," Lake Khuvsgal is Mongolia's deepest and purest source of fresh water. But it is now under threat.
Germany's government and auto companies are under pressure to cut pollution caused by the auto industry - a lucrative sector with an annual turnover of over $400 billion.
A UN report says living conditions in the Gaza Strip have worsened since the territory was blockaded by Israel. It also predicts that its only source of water will be "irreversibly depleted" by 2020 unless immediate action is taken.
Students in Senegal are turning trash into benches, and organisers this new scheme now hope to launch similar projects in Ethiopia, Morocco and Tunisia.
The UN agency called for the tobacco industry to compensate for its products that contribute to greenhouse gases blamed for climate change. However, it did not specify the amount of compensation.
May 31 is the World Health Organization's annual World No Tobacco Day. This year the UN agency called for tougher measures to reduce risks associated with tobacco use.
A report says Henderson Island, which is prized for its biodiversity, is polluted with an estimated 37.7 million pieces of plastic.
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