Authorities in India's northern Uttar Pradesh state deployed air purifiers to protect the historic Taj Mahal monument on Monday.

Air pollution in New Delhi and surrounding towns reached the worst levels so far this year on Sunday (November 3), with authorities in the world's most polluted capital city having already declared a public health emergency and ordered the closure of schools.

Indonesia warns its citizens of more choking smoke from forest fires on Tuesday as several provinces close schools due to worsening air quality.

Exposure to airborne pollutants increases the risk of "missed" miscarriages, researchers say.

Schools in two cities in the Indonesian part of Borneo island will be closed for a week after smoke from forest fires caused air quality to hit "dangerous" levels.

A US start-up firm is joining a list of companies developing flying cars. 

At least a third of the ice in the Himalayas and the Hindu Kush region will thaw this century as temperatures rise, scientists say.

California wildfires make its cities "most polluted" in the world.

Smog kills more than one million Indians every year and Delhi has the worst air of any major city on the planet, the World Health Organization says.

Exposure to toxic air both indoors and out kills some 600,000 children under the age of 15 each year, WHO warns.