No, that dust is always floating in the air.
Sneezing is a reflex, an action that we can’t really actively control, it just happens caused by something in our brain in response to some stimulation.
This reflex in some people (about 1 in 5) for some reason gets activated by sudden bright lights (like on a hot sunny day). And no one is really sure why, besides it’s just some kind of glitch in the brain.
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