Electrical resistance of air?

at voltage gradients less than ionizing (30kv/cm), and with dry air, is there an agreed upon resistance (or maybe called resistivity) of air, ie ohms/meter? Does the concept make sense, ie since these concepts are statistical properties of molecular phenomena, at sufficiently low values ideas like temperature, etc become meaningless since there is not a large enough population for statistics to apply. thus, is there an accepted resistivity of air, can you tell me its value or point to a source?