1 Amidala: {looking out into a dense fog} Curse this fog. I can't see a thing.
2 Amidala: Jar Jar, you're familiar with this sort of weather. Can you make out what's happening out there?
3 Jar Jar: Muy muy no, Senator Amidala. Meesa no see anything.
4 Amidala: Whatever idiot thought to make the Galactic Senate Chamber this damn big didn't realise it would generate its own weather systems.

That Galactic Senate Chamber is friggin' huge, isn't it? Surely it's at least as big as the Vehicle Assembly Building at Kennedy Space Centre in Florida. That building generates clouds inside it on humid days. So I don't think it's that much of a stretch to assume the Galactic Senate Chamber generates fog.

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2014-01-29 Rerun commentary: You might argue that with their advanced technology, they'd be able to stop fog from forming inside the Senate Chamber.

The question then becomes: Would you really want to?

This isn't a real Padmé Amidala figure, by the way, since I didn't have any of the LEGO minifigs of her at the time. (I still think I don't.)