EARLIER: Poor air quality and limited visibility has forced Port Campbell lifeguards to close the beach.

The Environment Protection Authority issued a warning for the south-west beach near the Twelve Apostles on Wednesday.

Life Saving Victoria lifeguard Lachy Eaton said it was the first time the beach had to close due to poor air quality.

"We haven't had to close the beach because of air quality before," he said.

"The air out there is hazardous for people with respiratory conditions like asthma or cardiac conditions, and for us.

"A lot of people have gone indoors but there's a few that have stayed out."

Life Saving Victoria said lifesavers would close patrolled beaches in the case of a perceived danger to swimmers and beach users, such as a shark sighting, pollution event, electrical storm or dangerous surf conditions.

In the case of a beach closure, the red and yellow flags will be taken down and a warning sign will be displayed on the beach to alert patrons that swimming is not advised.

Lifesavers will continue to observe the beach and monitor conditions (during patrol hours).

Lifesavers will reopen the beach when the perceived danger has passed. This will be indicated by replacing the red and yellow flags.

Victorian beach closures are listed on the VicEmergency website and app.

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