The mayors of Paris, London and Seoul on Wednesday launched an initiative to rate the most polluting vehicles in a bid to keep them off the roads of their cities.
California officials have proposed spending nearly $400 million over 10 years to slow the shrinkage of the state's largest lake.
More than 23,000 child refugees and migrants could risk respiratory infections, "even death from hypothermia," due to sub-freezing temperatures across Europe, warned the UN children's fund UNICEF on Friday.
The Seattle zoo says North America's oldest orangutan born in a zoo has died after struggling with respiratory problems.
For farmer Achmad Rusli, it was a season of smoke: Ten weeks without sunlight for his oranges, guavas and durians, thanks to deliberately set forest fires that burned a chunk of Indonesia the size of New Jersey.
The Philippines cancelled flights and put hospitals on alert on Sunday, as its southern and central islands were covered by thickening haze from Indonesian forest fires.
International efforts to douse raging Indonesia fires will fail and Southeast Asia could face several more weeks of choking smoke until the rainy season starts, Malaysia's environment minister warned on Monday.
A dense sandstorm engulfing parts of the Middle East left at least two people dead in Lebanon and hundreds suffering from respiratory problems on Tuesday, as officials warned residents to stay indoors.
Forrest Bird, an American aviator who helped save countless lives by inventing the first modern ventilator, has died at the age of 94.
Almost 400 people have been hospitalised with heart and respiratory problems caused by heavy air pollution in Tehran, with nearly 1,500 others requiring treatment, an official said Tuesday.