It was so large that it could be seen from space, with the Bureau of Meteorology releasing a satellite image showing it passing over Broken Hill on Wednesday.

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Earlier this week, residents in Broken Hill, White Cliffs and Menindee were sharing photos of their towns with an eerie red glow, but now the dust is moving east.

By Thursday morning people in Bathurst were sharing photos of a slight red glow over their city.

Meanwhile, NSW Health has issued a warning to those with a respiratory or cardiovascular condition to limit the amount of time spent outdoors and avoid vigorous exercise.

The warning also stated that dust particles vary in size from coarse (non-inhalable), to fine (inhalable), to very fine (respirable).

“Coarse dust particles generally only reach as far as the inside of the nose, mouth or throat,” the warning stated.

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“Smaller or fine particles, however, can get much deeper into the sensitive regions of the respiratory tract and lungs.

“These smaller dust particles have a greater potential to cause serious harm to your health.”