Unwind How a mega fire spread toward Sydney Updated : December 12, 2019 11:40 AM IST The bushfires grew to become one huge mega-fire, burning over 3,000 square km of land. Smoke and flying ash have covered Sydney for most of the past week, turning the daytime sky orange, obscuring visibility and prompting commuters to wear breathing masks. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.