Nothing on the city wided scanner.
Tabun nerve agent has a fruity odor, GF nerve gas smells like peaches and shellac, Soman nerve agent is also fruity.
If it was any of the above you would already be dead or have difficulty breathing, irritated eyes or nausea,
Normally I'd write this off as just another weird chemical-plant byproduct in that area, but the report of something similar around San Antonio strikes me as odd.
I agree that chemical weapons would have produced more noticeable effects almost immediately, but I wonder if airborne biological weapons might have a distinctive smell. It's probably nothing, so don't panic, but it did get me wondering.
On the other hand, maybe Frank's neighbor was eating a durian fruit...
The stench of this fruit has been described as similar to a corpse stuffed with overripe cheese, rotten onions, and turpentine. But it's supposed to taste divine, if you can get past the reek.
Spend any time around someone who has consumed "mass quantities" of asparagus and you'll have the same symptoms. Fortunately, I am no where near Houston!