If Assad attacks any of he neighboring nations, that is when we should get involved. This is a civil war. We need to butt out.
Funny, but the Chemical Weapons Convention, to which Syria acceded, makes no distinction in usage. It outlaws them and requires their verified destruction. Syria agreed to the convention and has consistently lied about its stockpiles.
https://en.wikipedia.org/wiki/Chemical_Weapons_Convention
“Following the August 2013 Ghouta chemical attack,[50] Syria, which had long been suspected of possessing chemical weapons, acknowledged them in September 2013 and agreed to put them under international supervision.[51]
On 14 September Syria deposited its instrument of accession to the CWC with the United Nations as the depositary and agreed to its provisional application pending entry into force effective 14 October.[52][53]
An accelerated destruction schedule was devised by Russia and the United States on 14 September,[54] and was endorsed by United Nations Security Council Resolution 2118[55] and the OPCW Executive Council Decision EC-M-33/DEC.1.[56]
Their deadline for destruction was the first half of 2014.[56] Syria gave the OPCW an inventory of its chemical weapons arsenal[57] and started its destruction in October 2013, 2 weeks before its formal entry into force, while applying the convention provisionally.[58][59]
All declared Category 1 materials were destroyed by August 2014.[36] However, the Khan Shaykhun chemical attack in April 2017 revealed that undeclared stockpiles likely remained in the country.
I use chlorine gas for my pool. It comes in gas cylinders. I keep a bottle of ammonia outside the shed and take the cap off and squeeze out some ammonia vapors before entering the shed. If chlorine gas is present the vapors becomr visible smoke. Chlorine gas is very common. Every hotel with a swimming pool uses it.