NSW win Shield game under 'toxic' smoke cloud

"Toxic" conditions at a smoke-blanketed SCG affected the vision and breathing of cricketers from NSW and Queensland during their Marsh Sheffield Shield game on Tuesday.

Spinner Steve O'Keefe helped the Blues extend their unbeaten start to the season, grabbing 3-28 as the table-toppers rolled the Bulls for 176 and made light work of their target of 42.

However, bushfire smoke at the iconic venue proved as big a talking point as the on-field action on day four of NSW's nine-wicket victory.

Queensland skipper Usman Khawaja said he felt like he was batting in Delhi during a knock of 54, noting it was "hard to breathe" and the haze affected players' vision.

NSW captain Peter Nevill agreed the smoke "significantly altered visibility".

NSW Health has urged Sydney residents to cut back on outdoor physical activity because of the smoke. 

The start of a recent second XI game in Sydney's west was delayed because of smoke but the relevant Air Quality Index (AQI) was more concerning in that case.

AQI readings were monitored throughout Tuesday but the number was never high enough to stop play.

Khawaja consulted the players' union on Monday and Cricket Australia medico John Orchard, who was at the SCG, on Tuesday morning.

"There were limitations there. If it got really bad ... we probably would have come off," Khawaja said.

"I've never played in anything like that in Australia.

"It was bad but it wasn't unplayable ... I wasn't going to use that as an excuse to come off and make a fuss about it, or say it's unsafe."

Air quality regularly affects cricket games in Delhi, most notably in 2017 when players donned face masks and some left the field to vomit during a Test.

Blues spinner O'Keefe declared he had never played in worst conditions at any cricket ground in the world.

"For someone like me who smokes 40 a day, it's now smoking 80 cigarettes a day," the 35-year-old quipped.

"The one thing they need to look at is the air-quality policy.

"It's not healthy. It's toxic ... that was shocking. I don't have kids, but if I did they'd be locked up inside, and if I was at home I wouldn't be training or playing.

"I'm sure they'll address it."

Khawaja, meanwhile, added one run to his overnight score, having produced his first half-century of the Shield season.

"I've felt really good ... I scored a lot of runs in the white-ball stuff, haven't scored as many runs in the red-ball stuff," the Test discard said.

Moises Henriques was named man of the match for his game-changing knock of 116.

NSW Blues: Daniel Hughes, Nick Larkin, Daniel Solway, Moises Henriques, Matthew Gilkes, Peter Nevill (c & wk), Sean Abbott, Steve O’Keefe, Trent Copeland, Harry Conway, Liam Hatcher

Queensland: Bryce Street, Matthew Renshaw, Usman Khawaja (c), Sam Heazlett, Charlie Hemphrey, Jimmy Peirson (c & wk), Jack Wildermuth, Michael Neser, Mark Steketee, Mitchell Swepson, Billy Stanlake

Beat the heat but still enjoy the cricket! Twilight tickets for the Domain Test in Perth are just $25, granting entry for the second and third sessions of the day. Click here for more