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Walk, bus, hop, drive–just get to 600 W. Kinzie St. and inhale. It’s the smell of chocolate emanating from Blommer Chocolate Co., and those who live in this near West Loop neighborhood–or just about anywhere in downtown Chicago–can attest to this olfactory treat. Kevin Schultz, Blommer’s manager, says the machines there produce cocoa powder, milk and dark chocolate 24-7 so passersby should be able to smell the fragrant scent at all times.

But when is the optimal time for inhaling that chocolatey air?

At Play asked Tom Skilling, chief meteorologist at WGN-TV, for an answer:

“Late night and early mornings, during the summer, are the best. That’s when winds are at the lightest, and smells like this can linger the most,” he says. “It’s also when temperature inversion is at its strongest. That’s when air above the city is warmer, and it traps a layer on the ground that helps contain the good smell.”