In Baltimore, WFO's can't be "x" amount of yards from a residence. Even though there are thousands of wood burning fireplaces.
That's not entirely true.
I spent a good amount of time dealing with this issue when constructing a business plan and considering opening a pizzeria in Baltimore.
One of the frustrating things is you may get more than one answer, depending on who you are talking to with the city.
The key issue isn't the proximity of the WFO itself to residential buildings, but the proximity of the venting exit point from residential areas (you may have meant this in your post). This is one reason why searching out a building that is taller, or at least as high as, any surrounding residential buildings would be beneficial (assuming you are opening a space in a more dense inner-city location where most buildings are connected). That way, you can increase the height of the venting out of the roof of the building and into an extension on top of the building....so, for example, the actual vent exit point where any smoke comes out could be 15 to 20 feet higher than the surrounding residential buildings.
This is where a prevailing wind study by the Maryland Department of the Environment may potentially be needed to prove that the prevailing wind is not a downdraft that would blow smoke from your high vent exit point downwards towards the residences.
Needless to say, this could require extensive venting/ductwork (length of ducting) which would obviously increase the all-in costs of installing a WFO in a space. Such a tall vent column could potentially cause issues with proper air/flow exhaust out of the oven.
There are obviously many configurations of venting and potential spaces to open a place in....some spaces maybe not needing as much legwork to get the go ahead for a WFO.
Good luck with your new pizzeria. Attention to detail with your plans and persistence in jumping through hoops will lead you to the WFO promised land, in due time. Best of luck! --K