Australia A strong wind carries smoke from dozens of wildfires to Sydney, causing pollution levels many times greater than the danger level.

Authorities say the concentration of smog in some locations in Sydney today is 10 times higher than the danger level, advising people to limit leaving home. The New South Wales state fire department says smog will cover the city throughout the day.

"The smoke will cause eye, nose and throat pain for most residents. People with asthma, emphysema and angina may be more severely affected," said Dr. Richard Broom, the director in charge. Environmental health at the New South Wales Department of Health, warning.

Fires have destroyed more than one million hectares of forests and farmland in the past few weeks, killing four people and burning more than 300 homes. More than 1,300 firefighters are deployed in New South Wales to deal with the fire in hot, dry weather and strong winds.

Forest fires in the dry season are common in Australia, but many scientists warn that the problem will be more serious due to climate change. Australian officials on 11/11 must raise the fire threat forecast for the Sydney region to a "catastrophic" level, for the first time since the new scale of the risk assessment of forest fires was applied in 2009. .