Buenos Aires is all smoky.
Supposedly it's because burn-offs by farmers have gotten out of control, but it's been going on for a suspiciously long time.
My suspicions were confirmed today when I read in the paper that really there's an invasion by extraterrestrials behind it all.  Mind you, the same journalist said that he's packing the smoke in cardboard boxes to sell as a souvenir of Buenos Aires... I'm not sure he's checked his sources...