Chemicals sway girl?

My DH works with chemicals. He says he works with Caustic, hydro chloric acid and ammonia. I have read that chemicals sway girl. Does anyone know if these chemicals sway girl??
We had both of our girls while DH was working at his current job (with chemicals) and one of his co workers had three girls while one guy had a boy.
So im wondering if these chemicals do sway girl if we still do most of the sway factors will we have a chance for a boy??
Or do these chemicals even sway.
Im just curious....thanks

There is always a chance for a boy.

Yes, I think chemical exposures tend to sway pink and there are gobs of studies that back it up. I don't know if any of them are specifically those chemicals per se, but overall, the studies have shown a consistent link between male exposure to industrial chemicals and more daughters conceived.