The ash cloud rose 10 kilometres (6.2 miles) into the air above a crater on the southeast of the volcano, the INGV National Institute for Geophysics and Vulcanology said on Twitter.
The nearby Vincenzo Bellini international airport in Catania closed at lunchtime Monday. Although it reopened after about two hours, it warned of delays.
Ash covered roads, balconies and the roofs of towns nearby, Italy's civil protection agency said.
The INGV said it had recorded a gradual rise in volcanic-seismic tremor -- induced by escaping gases -- which could be a sign Etna is heading towards another spectacular burst of fiery lava fountaining, known as paroxysmal activity.
At 3,324 metres (nearly 11,000 feet), Etna is the tallest active volcano in Europe and has erupted frequently in the past 500,000 years.
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