In a Finnish winter, the outside air is very cold, and contains little moisture. In a factory, which obviously needs to be heated, that small amount of moisture outside translates into a very low relative humidity inside. This in turn means that the rate at which static charges drain away is very much lower than in Singapore, where it is summer and relatively much more humid. At the same time, charging rates are usually higher, caused by friction between very dry materials.
The combination of high charging and low draining of charge means that static voltages are much higher, and much more stringent antistatic measures need to be taken.
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