Intense thunderstorms with heavy rains dampened bushfires on Australia's east coast on Friday and brought relief to farmers battling years of drought, but the city of Melbourne braced for another wave of unhealthy air over the weekend.

Australia, famous for its pristine beaches and wildlife, has been fighting bushfires since September, with fires killing 29 people and millions of animals, and destroying more than 2,500 homes while razing an area roughly a third the size of Germany.

Rains bring respite to three states

Victoria, New South Wales and Queensland, three of the most affected states by drought and bushfires welcomed the drenching rain this week, with fire services saying the falls will not extinguish all the blazes, but will aid greatly containment.

"Our fingers are crossed that this continues over the coming days," New South Wales fire services said on Twitter on Friday.

Australian bushfire
Wikimedia Commons

Severe storms are forecast to continue in many fire-stricken regions of New South Wales and Queensland, including areas that have not seen heavy falls for months, Bureau of Meteorology in NSW said, easing slightly the state's three-year drought.

While the wet weather brings relief to fire fighters and drought-hit farmers, it also comes with dangers, such as flash flooding and falling trees, many structurally destroyed by the intense bushfires.

Downpour clears some smoke in the air

The heavy downpours have helped to clean smoky air in Australia, but Sydney, Canberra and Melbourne remained on Friday in the world's top 100 polluted cities, according to AirVisual's pollution ranking for major global cities.

Melbourne, sheathed by a tick smoke earlier in the week that disrupted the Australian Open qualifying matches and other sporting competitions, is forecast to again be blanketed by unhealthy air over the weekend.

The smoke haze that has plagued Australia's major cities for weeks has been tracked by NASA circumnavigating the globe and the space agency satellites showed on Thursday there is also a large concentration of lower smoke over the Pacific Ocean.