Would you pay $100 for a whiff of Welsh air?

In some of the world’s most polluted cities, people apparently will: Sales of bottled air from fresh-smelling places are taking off.

An Australian company is hawking six-packs of air bottled in places like Bondi Beach in Sydney or the eucalyptus-covered Blue Mountains. A Canadian firm sells containers of Rocky Mountain breeze as an antidote to smoggy skies (“a shot of nature,” its marketing promises).

Aethaer, a British company, is hoping to turn packaged air into a popular luxury item in fast-growing markets like China. The company sells glass jars holding 580 milliliters (a bit more than a pint) of air from Wales — with a “morning dew feel,” according to its website — for 80 pounds, or $97.

The company’s 28-year-old founder, Leo De Watts, said he hoped buyers would come to regard his product as a collectible, like a “sculpture or a limited-edition print made by an artist.” “Clean air is actually a very rare commodity,” he said.