Padua points

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