No-one disputes that hundreds died here. But as the world's nations squabble the crime remains unanswered, the killers unpunished.
War emptied the suburb of Yarmouk in southern Damascus of its people. Assad's army holds it, but their prize is a ghost town.
This is a war at close quarters with every junction deadly. The front line has not moved in months - but the war is about to change.
Syrians living in rebel-held areas of the capital are manufacturing their own gas masks in case the area comes under another chemical attack like that of 21 August.
A home in the Ghouta region of Damascus has been converted into makeshift factory turning out 200-300 masks each day. Volunteers then distribute them to local residents.
"With our limited resources we were able to produce this protective mask that is made of cotton, coal, wax, and other similar material. God willing this mask will be effective and protect people," said one volunteer called Ibrahim Shami.
They hope that the masks, which are entirely funded by local donations, will be effective enough to give people time to escape any future attack.
Members of US Congress are to be shown a 13-minute video compilation of CIA-verified footage showing the victims of a chemical attack on eastern Damascas.
Senate Intelligence Committee chairwoman Dianne Feinstein said her committee was shown the "grim and ghoulish" video yesterday.
The 13-minute video is available to watch on senate.gov but viewers are advised that the footage contains some extremely distressing scenes.
Assad's CBS interview is unlikely to make any difference among the people and policymakers in America.
Much more significant here is the 13 CIA-verified videos, which have just been released, of the chemicals weapons attack on the outskirts of Damascus.
Some of those are extremely harrowing and today those videos are being shown to all members of Congress. That is much more likely to sway opinion.
It is in many ways the secret weapon of the lobbying effort now underway by the White House.
I think there is a growing belief, certainly among the regime, that a military that a strike now looks likely, they watch international television, they can see the mood in congress.
I spoke to one Syrian commander, who didn't give anything way, but he said things are being hidden and when it comes to it, we will be hiding too.
UN inspectors have arrived at a military hospital in Damascus. It is not clear why they are here, but it is possibly to meet soldiers hit by chemical weapons.
UN inspectors in Damascus were prepared to leave for a final examination of suburbs, but then returned to their hotel. It is not clear what problem is.
I do not think the news of the House of Commons vote has quite sunk in here in Syria.
It is Friday, traditionally a day off and a day of prayer, but I do think people - and the few I have talked to this morning - are stunned.
There is a general expectation, almost across the Arab world, that whatever America does, Britain will be there. So I think this will definitely shock people.
I talked to one government official yesterday who was very, very interested in the British vote. She said she saw that 60 percent of people in the UK were against military action and this will certainly confirm that in her view.
I think there is little to celebrate in Damascus but I think the Assad regime will be very happy that Britain appears not to be joining in any military action.