Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Australians Flee as Soaring Temperature, Winds Threaten to Fan Fires Reuters SYDNEY - Residents in parts of eastern Australia evacuated their homes on Tuesday as soaring temperatures and strong winds threatened to fan bushfires in a giant blaze north of Sydney, the country's biggest city. Air quality in parts of Sydney plunged as the city awoke to another thick blanket of smoke, disrupting transport services and prompting health warnings from authorities. More than 100 fires are ablaze in New South Wales (NSW) and Victoria states in eastern Australia, many of which have been burning since November. The fires have killed at least four people, destroyed more than 680 homes and burned more than 2.5 million acres (1 million hectares) of bushland. After a brief respite over the weekend, conditions are set to worsen on Tuesday as temperatures top 40 degrees Celsius (104 Fahrenheit) and winds pick up, stoking fears that fires could spread to more populated areas. Such forecasts have heightened worries about a so-called megablaze burning north of Sydney. Stretching for more than 60 km (37.2 miles), the firefront in the Hawkesbury region, about 50 km north west of Sydney, could grow if the forecasted winds arrive, authorities have warned. While there is no official evacuation order, many locals have decided to leave their homes, Hawkesbury Mayor Barry Calvert told Reuters. "It is eerie, many people have decided to leave, and I'm going to do the same," said Calvert. "I've been through this before about 20 years ago when I stood outside my house looking at flames 50 feet high, I decided then that I would leave early if it happened again." .