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Categories of
stability of the
Amount atmosphere
0
№ of toxic (degree of Wind t, C
Toxic substance vertical air speed,
substance resistance – (m/s)
Q 0, t
DVAR)
4 chlorine 10 convection 2 +20
5 hydrogen sulfide 70 isotherm 1 –20
6 ammonia (storage under 100 inversion 3 0
pressure)
7 chlorine 50 isotherm 2 +40
8 sulphurous anhydride 70 inversion 1 +20
9 formaldehyde 30 isotherm 3 +20
10 chloropicrin 100 inversion 1 0
11 chlorine 70 convection 2 +20
12 sulphurous anhydride 50 isotherm 2 0
13 chlorine 70 inversion 1 +20
14 formaldehyde 30 isotherm 1 0
15 ammonia 100 isotherm 1 –20
(storage under pressure)
16 chloropicrin 50 inversion 2 +20
17 sulphurous anhydride 300 convection 2 –20
18 chlorine 70 isotherm 3 +40
19 formaldehyde 20 inversion 1 +20
20 chlorine 100 inversion 1 +20
21 sulphurous anhydride 70 isotherm 1 +20
22 chlorine 50 inversion 2 0
23 chloropicrin 100 convection 1 –20
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