It said almost 11,000 tonnes per year of NOx had been released via exhaust gasses, up from the 6,000 tonnes per year it had previously reported.
The North West Shelf Venture’s Chief Executive, Steve Ollerearnshaw, said the error had not affected the concentration of NOx which were regularly measured in gas turbine exhausts stacks, and that the Onshore Gas Plant continued to comply with licence conditions.
Oxides of nitrogen are produced at the Onshore Gas Plant at Karratha as part of the LNG and domestic gas production processes. NOx is formed through the combustion of hydrocarbon and air in gas turbines and furnaces.
Woodside said there NOx levels in the nearby townships of Karratha and Dampier were within national health standards and that levels in the onshore gas plant were at least 10 times below occupational safety and health standards.
