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Small generators rarely have emissions control systems anywhere near as good as the main engine (and it most cases, far worse). They usually have a completely open-loop fuel mixture control: a carburetor set to provide an adequate air/fuel ratio when the fuel tank is half full.

So, saying that only the generator is running isn't a very effective way to argue that these trucks are low-polluting.

While sometimes true, have you looked at some of the more modern portable and inverter generators lately? A Honda EU2000i can run the electrical needs of a typical food truck for an entire shift (~5 hours) on 1 gallon of gas.

Some parking spots that rent to food trucks provide electric too, so no generator running at all. This may be rare in NYC though.

I have seen many that just run off propane and keep their uncooked food on ice during the day. Running off an actual generator is something I have only begun seeing recently.