Here's what you need to know this morning.

Australians buying more alcohol in lockdown

A fifth of Australians have purchased more alcohol since the coronavirus lockdown began and are drinking more in home isolation, according to a new poll.

A national YouGov Galaxy poll conducted at the beginning of April was commissioned by not-for-profit group Foundation for Alcohol Research and Education (FARE).

It found 20 per cent of the 1,035 respondents were purchasing more alcohol, 70 per cent of those were drinking more than normal, and a third of them were now drinking daily.

FARE said the findings were concerning and called on the Government to limit marketing and delivery of alcohol services during the lockdown period.

Sydney's falling petrol prices

More than half of Sydney's petrol stations are selling petrol for less than $1 a litre for the first time in almost four years, and falls are set to continue.

NRMA spokesperson Peter Khoury said the plummeting wholesale price meant Sydney's average price would fall below 90 cents per litre in the coming days, which would mark an 18-year low.

"The people currently driving on our roads are healthcare workers and first responders, workers delivering essential services and families shopping for groceries — just the people who desperately need some relief at the bowser right now," Mr Khoury said.

Mr Khoury said falls were reflected in 57 per cent of petrol stations "across all the major brands and across the whole of the city".

"Suburbs that are normally very expensive are now seeing prices fall," he said.

Closed clubs amid coronavirus

Many of Sydney's iconic community clubs fear they are on the brink of permanent shutdown as mandatory coronavirus restrictions devastate business.

The German-Austrian Club in Cabramatta, which has operated since 1965, was forced to close its doors for the first time last month to comply with social-distancing rules.

"The older people wouldn't have a clue where to go. It's like having a sledgehammer over your head, it's just awful," club member Franz Bouvier said.

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Class action over PFAS

A new class action against the Department of Defence over PFAS contamination involving seven communities across Australia, will be filed today in Federal Court.

Law firm Shine Lawyers said the class action alleged more than 40,000 residents across the nation were exposed to toxic chemicals used on military bases, contaminating land and water sources.

Residents in seven communities joined the legal action, including Wagga Wagga, Wodonga, Richmond, Darwin, Townsville, Edinburgh and Bullsbrook.

It comes after a similar class action in February, which involved three other communities, resulted in a "milestone" settlement with the Defence Department.

Teen missing in Sydney

Authorities said Crystal Walker had orthodontic braces and was last seen wearing a grey jumper. ( Supplied: NSW Police )

NSW Police are searching for a teenage girl who went missing from Sydney's inner west almost three weeks ago.

Crystal Walker, 14, was last seem at Petersham Railway Station about 9:00am on Thursday, March 26.

Authorities believed she was frequenting the general areas of Waterloo, Redfern and Lismore.

She was described as being of Aboriginal or Torres Strait Islander appearance, about 175 centimetres tall, of thin build and with long dark curly hair.