The removal started on Monday and is estimated to take two to three weeks, Southern NSW Local Health District (SNSWLHD) chief executive Andrew Newton said.

This is part of the enabling works for the Yass Hospital redevelopment that includes an additional treatment bay, two new in-patient beds and a dedicated ambulance entry point.

The asbestos is in the roof of the main hospital building and the area will be sealed off, Mr Newton said. However, he also said it's unlikely that any patients or services will be interrupted.

The SNSWLHD also said the chance of anyone being exposed to asbestos during the removal is very low.

"Asbestos only poses a risk to human health when elevated levels of asbestos fibres are breathed in. Due to the control measures in place ... people do not need to take any particular precautions to protect their health," an information leaflet by SNSWLHD read.

Asbestos is found in many buildings built before the 1990s. Yass Hospital dates back to the late 1800s. However, there have not been any elevated levels of airborne asbestos at the hospital to date, the leaflet also said.

There will be a doctor available 24/7 at Yass Hospital over Easter. Mr Newton said some residents mistakenly thought the service would stop for the holiday.