Authorities in New Delhi shut schools, halted construction and banned nonessential trucks from entering the city after air pollution shot up to its worst level this season.

Milton grew quickly into a Category 5 storm Monday morning and is forecast to make landfall in Florida midweek.

Wildfires across the western United States and Canada have put millions of people under air quality alerts, as thousands of firefighters battle the flames.

Residents and businesses of the townsite inside Jasper National Park found out Saturday for certain whether or not they have anything to return to.

Sakha is now the fourth region in the Far East where a state of emergency is currently in place due to wildfires. The other three are the Zabaykalsky and Amur regions, as well as the republic of Buryatia. Russia’s wildfire season officially began in early March. By mid-April, regions in the Far East recorded nearly twice as many fires as they had during the same period last year, with most blazes caused by human negligence.

Extreme pollen spread in Eastern Norway is causing significant discomfort for allergy sufferers due to a combination of a long winter, delayed spring, and sudden warm, dry weather.

Samuel Roberts, 65, and Mark Elson, 51, said they were not prepared to be lost along the shore of Great Slave Lake when they headed out for a short fishing trip. But it became smoky and foggy, and the men became disoriented. The following day, when the air cleared, Roberts said they couldn't recognize anything. "We had no idea that we crossed over the Dettah side and [were] headed to the East Arm," said Elson.

An explosive eruption Friday at Shishaldin Volcano on the Aleutian Chain raised renewed unrest, resulting in a higher level of warning status by the Alaska Volcano Observatory.

Canadian fire crews on Thursday battled to prevent wildfires from reaching the northern city of Yellowknife, where all 20,000 residents are leaving by car and plane after an evacuation order was declared.

More than 271 structures have been impacted by the Lahaina fire, the U.S. Civil Air Patrol and Maui Fire Department reported after flyovers of Lahaina town on Wednesday..

Behchokǫ̀, a community of about 2,000 people northwest of Yellowknife, issued an evacuation order shortly before 6 p.m Monday evening. A wildfire is burning about 25 kilometres to the east of the Behchokǫ̀, and 45 kilometres northwest of Yellowknife. 

The smoke is from numerous wildfires burning in Canada’s Yukon Territory.

Wildfires are still burning in Quebec's northern zone, with 11 fires still considered out of control early Tuesday morning. However, the provincial forest fire prevention agency, SOPFEU, said rain since Sunday and rising humidity have helped stabilize the flames for the time being.

Grieving parents who lost their nine-year-old boy last week say their son died after a severe asthma attack made worse by wildfire smoke engulfing parts of British Columbia.

At last measurement, the fire had burned about 14,000 hectares and remains within 10 kilometres of Tulita, but is on the far side of the Mackenzie River.

Smoke from Canadian wildfires will make breathing outdoors difficult today for millions of people across the six largest provinces and into the United States.

A fog-like mist in northern Iceland may be connected to forest fires in Canada, with meteorologists suspecting that diluted smoke from the fires has reached the country due to prevailing winds blowing from west to east.

From thick smoke to a complete evacuation, several Cree communities in northern Quebec are dealing with impacts of the wildfires raging in the region. "The fire is moving aggressively, and it's still moving quickly, headed towards Oujé-Bougoumou. This has created a lot of fear and anxiety in the community.

Air quality in Calgary remains poor as wildfire smoke blankets the city. The situation is expected to last through the long weekend.

Officials say a wildfire in Southwest Washington that ballooned Sunday, causing regional air quality issues, may have been started by a firework or firearm.