"fragrant air" is correct and usable in written English.
You can use it to describe a pleasant scent, often in the outdoors. For example, "The fragrant air of the lavender field was a reminder of summer."
She pulled back the lever that opened the door, letting fragrant air onto the bus.
Yet the charge of decoration still hovers in the fragrant air.
The 120-foot climb brought our small group of visitors to the light, fragrant air of rain forest treetops.
I opted for the Big Sur, which had the most fragrant air ("scent notes: wild ginger, burnt honey, salt, damp ground").
They arrived in the late afternoon and fanned out for a while, admiring the flowering trees, breathing in the fragrant air.
Calm and modern, Bay Leaf looks like a brasserie; the fragrant air, sizzling onions and tandoori oven offer hints of its Indian origins.
The "pickle-fragrant air" is redolent of truck exhaust.
They seem appropriate here in the Bronx too, at the entrance to the annual Holiday Train Show, because this exhilarating exhibition makes you feel a little like an alien visitor just coming ashore; everything familiar is skewed and strange in the fragrant, humid air.
Sergeant Wood's décor is country, the air fragrant with spice.
Her new song booms through air fragrant with the fresh-paint smell of things going right.
Late autumn is sensually breathtaking: ingeniously irrigated green wheatfields weave through the valley floors, the air fragrant with the jasmine-like scent of Russian olives and freshly milled grains, and everywhere are flames of orange, rust and lime-green leaves.
