Date	Agent	Casualties (Official)
		Fatal	Non-fatal
Apr - May 1915	Chlorine	350	7,000
May 1915 - Jun 1916	Lachrymants	0	0
Dec 1916 - Aug 1916	Chlorine	1,013	4,207
Jul 1916 - Jul 1917	Various	532	8,806
Jul 1917 - Nov 1918	Mustard gas	4,086	160,526

Gases used in WW I

A=Allies, G=Germany/Austria-Hungary

Name	First use	Type	Used by
Chlorine	1915	Irritant/Lung	Both
Phosgene	1915		Both
Chlormethyl chloroformate[?]	1915		Both
Trichlormethyl chloroformate[?]	1916		Both
Chloropicrin[?]	1916		Both
Stannic chloride[?]	1916		A
Phenyl chloride[?]	1917		G
Dichloromethyl ether[?]	1918		G
Diphenyl chlorasine[?]	1917	Irritant/Sternutatory	G
Ethyl dichlorarsine[?]	1918		G
Ethyl carbazol[?]	1918		G
Benzyl bromide[?]	1915	Lachrymatory	G
Xylyl bromide[?]	1915		G
Methyl chlorosulphonate[?]	1915		G
Ethyl iodoacetate[?]	1916		A
Bromacetone[?]	1916		Both
Methyl-ethyl ketone[?]	1916		G
Acrolein[?]	1916		A
Hydrocyanic acid[?]	1916	Paralysing	A
Sulphuretted hydrogen[?]	1916		A
Mustard gas	1917	Vesicant	Both

Estimated production of gases (by type)

Nation	Production (metric tons)
	Irritant[?]	Lachrymatory[?]	Vesicant[?]	Total
Austria-H	5,080	255	-	5,335
Britain	23,870	1,010	520	25,400
France	34,540	810	2,040	37,390
Germany	55,880	3,050	10,160	69,090
Italy	4,070	205	-	4,275
Russia	3,550	155	-	3705
USA	5,590	5	175	5,770