Doctors are urging people to stay indoors as much as possible and avoid exercising outside as heavy smoke rises above bushfire-hit NSW.

More than 200 homes have been lost in fires west of Sydney since Thursday, and 59 fires were still burning on Monday morning.

NSW Health says many areas in the state are experiencing poor to very poor air quality, even hundreds of kilometres away from the fires.

The Australian Medical Association’s NSW president, Brian Owler, says heavy exercise should be avoided.

‘The last thing you want to do is to go out for a jog when you’re breathing in such heavy pollution,’ he told AAP.

Asthmatics should also ensure they have their puffers with them at all times, he added.

Professor Wayne Smith from NSW Health urged asthma sufferers to follow their asthma action plan.

‘Fine particles can irritate the lungs of healthy adults, so it is best to avoid any prolonged outdoor exercise,’ he said in a statement.

via Bushfire smoke sparks health warning | Sky News Australia.

Read on to find out local air quality levels where you are.