Air pollution in Beijing dropped slightly last year, although levels of the most dangerous small particulate matter remained more than three times the internationally recommended limit.
Women exposed to high levels of traffic pollution during the second trimester of pregnancy are at higher risk of giving birth to a child with weak lungs.
Australia axed a divisive carbon tax after years of vexed political debate, handing the government a key victory after it went to the polls last year vowing the levy would go.
The US space agency is to launch on Tuesday a satellite that tracks atmospheric carbon dioxide, a leading greenhouse gas that contributes to global warming.
Sixty percent of underground water in China which is officially monitored is too polluted to drink directly, state media have reported, underlining the country's grave environmental problems.
At least 170 dead pigs have been found in a Chinese river, state media reported Thursday -- the latest in a string of similar incidents that have raised fears over food safety.
Chinese companies have offered up a fresh idea to help pollution-weary travellers while cashing in on public concerns over dirty air at the same time -- smog insurance.
Thousands of cars will be banned from Parisian roads on Monday as the city tries to curb dangerous pollution levels by introducing alternate driving days for the first time in nearly two decades.
Paris authorities said Thursday they would make public transport free for three days to encourage drivers to leave their vehicles behind due to severe pollution caused by unusually warm weather.
Chinese Premier Li Keqiang said he is "declaring war" on pollution, describing it as a "red-light warning" against inefficiency as he sought to address public concerns on issues from acrid smog to food safety.
Dangerous smog which has blighted swathes of northern China in recent days has prompted a spike in air purifier sales, local media reported Monday, as pollution continued to shroud Beijing.