It's called incendiary bombing, or more commonly firebombing, and it utilizes fuel combustion in urban environments.
The reason you might not find much on it is that it's a civilian-killing tactic, thus not something we employ in the modern era. It was reprisal for what was done to England, though I believe a very small amount may have been done during some of the Cold War Era campaigns. We certainly bombed a lot of cities, but we tended to focus purely on strategic production, transportation and communication targets.
It may be difficult to look up because "Fire Bombing" has been commonly used since then as a name for arson. I'll do a little research now, since there's interest:
http://en.wikipedia.org/wiki/Bombing_of_Dresden_in_World_War_IIIt seems the figures may have been exaggerated by the media of the time, which estimated over 200,000 deaths in this one bombing. I guess old veterans and the History Channel aren't the best sources for some information.
Here's a much better example.
http://www.folds.net/Haney/firebombing.htmlAnother. I'd heard about the fire sucking people down the streets, but I didn't know that was in Japan.
http://www.commondreams.org/headlines02/0310-01.htmA final source showing the entire firebombing campaign against Japan, in which raids targetting mainly industrial centers had huge collateral damage and killed hundreds of thousands even in areas where civilians had fled.
Turns out this isn't hard to research at all. Given modern precision-bombing technology and the fact that zombies don't intelligently hide or flee, I would expect we could blanket an entire city and not just a dozen blocks of industrial production. The resultant fires would be entirely inescapable, and would probably cause polution similar to a small volcanic eruption. Possibly not, as a single large volcano can cause more pollution than the entire history of the automobile industry.