Biohazard cloud formation seen in 2012

Hi all. Sorry if this isn't the right place to post this.

It's not specifically ufo related but I've always found it a curious experience. In France 2012 I saw a weird cloud formation as I was headed home with a friend. Was seated on the wrong side of the bus and couldn't get a good view so decided to step off early to catch a better view.

The video is posted on my public artists profile but is unlisted as I only wish to show it to you guys here.
Made subtitles as we're speaking a few different languages.
Just thought I'd share



Don't mind the 3 little black dots in the centre of the image, it's just image sensor damage in my phone.

This is just a wild guess on my part but, it immediately reminded me of the Olympic Games symbol.

The games were held in London in 2012. There is a distance of 521 miles between London and France. Is it even possible it could have carried something like that so far a distance?

These are not necessarily from the 2012 London ceremony, I just found them online. Here's a couple pictures of the opening ceremony fireworks display...

As the Olympics were held in summer, and the video was recorded in late November, it's probably safe to say that something didn't drift on over. Although London is fairly close by!
The clouds were at first much more solid and distinctly 3 well marked rings perfectly aligned. By the time I got off the bus however, they had faded quite a bit and continued to do so as we walked.

My eyes are old and tired. When I looked at those pictures posted above, I thought the bright yellow circles were some type of cool fireworks and that it ended up looking like the smoke black ring that appears in the first picture after they burned out. But, even that is a moot point because as you say, the timeline is all wrong. Thanks for clearing that up for me.

Here comes my second try at wild guesses... lol

looks like planes in a military exercise or maybe a missile test