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Steak-Scented Billboard Entices Drivers
In addition to car exhaust and road grime, travelers along Highway 150 in North Carolina can now enjoy the smell of a barbecue thanks to a new billboard. The work of ScentAir, which provides custom scents for businesses, the advertisement for a local grocer emits the smell of charcoal and black pepper over the highway. "Marketing director Murray Dameron said the beef scent was emitted by a high-powered fan at the bottom of the billboard that blows air over cartridges loaded with BBQ fragrance oil. 'It smells like grilled meat with a nice pepper rub on it,' he explained."
NPR covered this a week go. Granted, this is idle, but come on...
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You can't electronically reproduce a smell in a way analogous to a speaker. Olfaction is a chemical sense (along with taste) and requires chemicals to be present in order to be smelt. In other words, any device for producing aromas has to have a reservoir of aroma chemicals already present, in the same way a printer must have a reservoir of ink. Unfortunately, unlike a printer where you can produce a good range of colors from 3 primary colored inks, the same doesn't happen with smell. There is no such thing (as far as anybody has been able to identify) as a primary smell. You can't reproduce the smell of benzaldehyde by mixing other chemicals in any simple straightforward way.
That's not to say you can produce a range of aromas by mixing chemicals, of course you can, it's what perfumers and flavorist do all day; but the palette of chemicals they use for, say, producing steak aromas is both large and quite different than the palette they'd use to produce, say, strawberry aromas. If you wanted a palette that could reasonably cover the entire range of aromas you might smell in everyday life (from steak and strawberries to gasoline and dog shit) it would easily run into several hundred chemicals.