Hey there... I was just sitting here on my computer when I began to hear this very loud machine noise, like a lawn-mower right outside my window, at 12:20 at night. So I looked outside and there was a truck that looked similar to a street cleaner that was driving slowly and has a rectangular tube coming off the back that was emitting a steady, and rather heavy stream of a mist-like gas that was grey-ish white in color. It has a blinking yellow light and like I said, was rather loud. I was just wondering what this was, because the gas is kind of worrying me, and I've never seen it in my neighborhood before.
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