Padua points

Packing Group	Hazard Zone	Ratio of Volatility and LC50
I	A	$R\geq 500$ and $LC_{50}(mixture)\leq 200{\tfrac {mL}{m^{3}}}$
I	B	$R\geq 10$ and $LC_{50}(mixture)\leq 1000{\tfrac {mL}{m^{3}}}$; and The criteria for Packing Group I, Hazard Zone A, are not met.
II	C	$R\geq 1$ and $LC_{50}(mixture)\leq 3000{\tfrac {mL}{m^{3}}}$; and The criteria for Packing Group I, Hazard Zones A and B are not met.
III	D	$R\geq {\tfrac {1}{5}}$ and $LC_{50}(mixture)\leq 5000{\tfrac {mL}{m^{3}}}$; and The criteria for Packing Groups I, Hazard Zones A, B and Packing Group II.