Workplace hazards outside the window

I am entering the last of my four week’s work on a construction site in Sydney.  In my first week, the city was blanketed with thick smoke from nearby bushfires and all construction sites closed early for a day because the air was deemed hazardous.  That smoke has persisted for all of my time in Sydney.  Last Friday I was on site when the occasional piece of ash fluttered on to me.  The bushfire situation is unprecedented and my experience has shown me that Australia and Australian companies seem to struggle with how to operate in a disaster that will undoubtedly return.