NSW resources minister John Barilaro said introducing the standard early was further evidence of NSW's commitment to best-practice for the mining industry.

He said lowering the coal dust respirable standard to 1.5 milligrams per cubic metre from February 1 2021 would help ensure the long-term health and wellbeing of coal miners and further reduce their risk of suffering   workers' pneumoconiosis, otherwise known as black lung disease.

NSW's current standard of 2.5mg/cu.m, in place since 2004, is already the most rigorous standard in Australia.

"Coal mining is vital to the economic prosperity of NSW and underpins the state's energy needs, and the NSW government remains committed to ensuring the men and women who work in our coal mines go home safely each day," Barilaro said.

"The decision to fast-track these more stringent standards for coal dust exposure was an easy one and is a great example of mine workers, mine operators and government working together to ensure we have robust frameworks in place to address this insidious disease."

In late 2019, national work health and safety ministers met and agreed to implement the new coal dust respirable standard in the workplace exposure standard for airborne contaminants from December 2022.

Introducing the standard early was recommended by the NSW Mine Safety Advisory Council, which is made up of key employers, unions and government, with the change to be supported by a campaign from the Resources Regulator called Black Lung Disease: An ongoing focus in NSW.

The campaign includes a video and posters featuring MSAC chairman George Souris, chief inspector Garvin Burns and respiratory physician Dr Deborah Yates, and is designed to educate mine workers and mine operators of the risks associated with respirable coal dust.

The regulator is also working with MSAC on further guidance around dust, which will be released over the coming months.

In February 2021, NSW will also be the first mining jurisdiction in Australia to implement an exposure standard of 0.1mg/cu.m for diesel particulate matter, which follows almost a decade of NSW mining industry guidance advising mine operators to comply.