Official air breakdown voltage?

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Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>


I have read all over the net, around 25KV/inch  <<I use this one
I read on one place,           around 30KV/inch
Now i have just been told    around 30KV / cm  !!!!   Thats 3 times 
the voltage I have been told

It is common sense that air pressure, humididty, current, and time of 
day all affect air breakdown voltage, but:

IS there any official way to determine exactly what air breakdown 
voltage is? ( such as KV/distance )