Always check your withholding with this tool if there are personal or financial changes in your life that might change your tax liability, for example new employment or a promotion changing income amount, or new family members altering the number of dependents you claim.
believe the answer you're looking for has to do with the pressure-altitude-voltage derating related to corona discharge, which increases (gets worse) with higher altitude and peaks at around 80-100,000' Typically this is considered to occur at votlages above 300 V peak, but be sure you are accounting for all transients and internal voltages.
Some effects of mercury contact can be immediate, but the effects of mercury exposure also may be delayed. Possible immediate effects may include dizziness, vertigo, flu-like symptoms, burning or irritation, pale or clammy skin, irritability, and emotional instability.