Morning smoke haze from a distant bushfire (wildfire)
We've had several months of unusually low rainfall in much of New South Wales and now that it's summer the higher temperatures are further drying off grasses. Summer storms, or more precisely the accompanying lightning, can leave a trail of ignited vegetation behind them.
We've had several bushfires within a 12 km (8 mile radius) of our property is the fast few months but nothing of note in the past month. The largest fire, about 160 km (100 miles) distant claimed about 120,000 hectares (300,000 acres).
Winds will bring distant smoke to us especially in the early morning or late afternoon. This photograph from a few mornings ago shows a brown, smudgy smoke haze across the entire horizon. The smoke has travelled a reasonable distance given that the nearest fire at the time was 80 km (50 miles) to our west.