A faint haze hangs over the Ibirapuera park this morning, blurring the outlines of the skyscrapers downtown. The air has that heavy, slightly smoky feel, like the city is wearing a thin grey scarf, and you might notice your eyes feeling a bit gritty if you’re out for a while. Breathing isn’t uncomfortable for most folks, but it’s not that crisp, clean feeling you get after a good rain in São Paulo.

It’s still a fine day to be outside and grab a coffee on the sidewalk, but I’d hold off on that long jog or a vigorous bike ride until the air clears. If you’re planning to air out the house, maybe keep the windows cracked just a little instead of wide open, especially during the busier traffic hours. The air is heavier today than usual, so a gentle stroll is better than a hard workout.

For the little ones, older neighbours, or anyone who deals with asthma or a tricky heart, it’s a smart day to take it easy and stay indoors as much as possible. If you have to head out, keep your errands short and don’t linger near busy roads, where the exhaust adds to that thick feeling. It’s not a dangerous day, but a bit of caution goes a long way for those who are extra sensitive.

The good news is that this kind of day usually passes quickly in São Paulo, often with a breeze or a late-afternoon shower. So enjoy your morning at a relaxed pace, keep the windows partly shut, and don’t worry too much. By tomorrow, the air will likely be back to its usual, livable self.