Probably of the more scenic spots in New England is the Franconia Parkway going through Franconia Notch (former home of New Hampshire's Old Man on the Mountain). The fed and the state spent a lot of money building the parkway through the Notch to connected up Interstate 93 on either side. There had to be congressional action to build it as its 2 lanes in spots. Almost in the middle of it is state campground. Frequently when I drive through in the summer there is distinct wood smell and haze as I round the corner past the campground.
Barbeque smokers are potentially major sources of low level smog. As mentioned in one my posts Polyaromatic Hydrocarbons (PAHs), are the major source of smoke flavor for the meat in a smoker yet also are a major form of air emissions from poor wood combustion. Effectively a good barbeque grill is a smoke dragon. I am surprised the EPA has not gone after commercial BBQ operations but expect they realize the potential PR hit they would take. Much as well done barbeque tastes great, its usually flagged by health authorities that its one of least heathy ways to cook meat.
They did go after large bakeries years ago as the fresh bread smell is sign of Volatile Organic Compound (VOC) Emissions. Most large bakeries have to install catalytic oxidizers to "burn" the oven exhausts. To date I am not sure if the chocolate smell near chocolate factories has any health effects