When I worked in a fab, we saw process variation driven by weather patterns, so fabs are quite sensitive to their environments. (Barometric pressure can affect

When I worked in a fab, we saw process variation driven by weather patterns, so fabs are quite sensitive to their environments. (Barometric pressure can affect both diffusion and wets.) But I have a hard time seeing how a nearby farm would affect a fab. The air handling systems are pretty intense, so I imagine you'd see more filter changes if anything, and every change point has the potential to harm the process. But that's a pretty indirect mechanism. A sibling comment mentioned heavy machinery, which also seems unlikely. The lithography equipment had its own pedestals grounded in bedrock, separate from the building foundation, and each stepper/scanner has its own vibration damping. The rest of the equipment is less sensitive to vibration.