According to some social media sites, Goulburn has the worst air quality in the world on Sunday at about 7pm.

But a Southern NSW Local Health District (SNSWLHD) spokesperson said on Monday there had not been a spike in these cases.

"I've checked with the clinicians at Goulburn, Crookwell, Yass and Queanbeyan," the spokesperson said.

"They have all checked the numbers and says there isn't any more or less than the usual number of presentations around respiratory

"In other words, there is not a spike or increase in smoke related presentations being experienced as a result of the recent bushfires."

To check the air quality index, visit health.nsw.gov.au/bushfire-smoke

Previously the SNSWLHD had advised people to avoid vigorous outdoor physical activity in the bushfire smoke.

"People have been advised to stay indoors and avoid exercise or strenuous outdoor activity," a health spokesperson said.

Read also: Strike Force charges man in Goulburn on firearm, drug offences

"Smoke from bushfires is lowering the air quality and this may affect people with already diagnosed respiratory conditions. Elderly people and those with heart and lung conditions are most at risk.

"The advice is to stay indoors, with the doors and windows closed, to avoid irritations to the eyes, nose and throat, and to avoid aggravating existing medical conditions.

"Also try to spend time in air-conditioned venues such as cinemas, shopping centres and clubs.

"People with asthma or a lung condition should follow their survival plan and carry medications with them."