Emissions from proposed LNG plant are acceptable: state

THE office of Queensland's coordinator-general says nitrogen dioxide emissions from the proposed Arrow Energy LNG plant on Curtis Island will be at an acceptable level.

Environment group Save the Reef on Tuesday raised concerns about air quality if a fourth LNG plant was built on the island, saying it would impact the health of Gladstone residents.

Save the Reef campaigner Dr Libby Connors said the Coordinator-General had "let Gladstone down badly" on the $17 billion project.

"(Project owner) Shell admits in their supplementary report to the environmental impact study that their plant will increase nitrogen dioxide emissions over the township which already exceed the standard for human health and well being," Dr Connors said.

The proposed plant was approved by the coordinator-general last month and is now before the federal Environment Minister for assessment by October 23.

The ABC reports the coordinator-general's office said in a statement emissions from the Shell Australia/Arrow Energy plant would have a negligible effect on air quality.

The coordinator-general concluded this was acceptable.