A thick haze is hanging over Sydney for a second day, with those with respiratory conditions being warned to remain safe.
Westerly winds pushed smoke over Sydney from hazard reduction burns carried out by the Rural Fire Service in the Southern Highlands on Sunday.
Smoke plume modelling indicated inversion, which locks air over low lying areas, would ease on Monday morning and the haze would dissipate soon after - but that didn't happen.
Air quality monitors reported high amounts of particles and low visibility in numerous suburbs - with "poor" and "very poor" air hanging around until late on Monday evening.
Hazard reduction burns continued through Monday as firefighters took advantage of still air and cool weather.
That is expected to result in more smoke settling over the city until Tuesday afternoon.
