The first pic is very strange, in the second I don’t think the dust in the air is the cause.
This is another similar image:
3264 x2448 | EMBED PREVENTED, IMAGE TOO LARGE: http://imageshack.us/a/img16/2545/orbsflash.jpg Click here to see our image rules. |
http://imageshack.us/a/img228/2545/orbsflash.jpg
Looking at the full size of the big orb, dust cannot do this imho. It’s something else.
What's the picture of? And even if one case where orbs occur can't be obviously explained as dust doesn't mean it's never the possible cause. Seriously - search here for "orbs" - you'll find a number of threads on the topic.

