The air in 상파울루 today feels a bit heavy, like it's holding its breath. You might notice a slight haze when you look down a long street, and breathing feels just a little thicker than usual, not unpleasant but not that clean, crisp feeling we all love.

It's still a decent day to be outside for a quick errand or a gentle stroll, but I wouldn't pick today for a long, hard run. If you're planning to open the windows for a good cross-breeze, you might want to wait until later in the evening when the air tends to settle and feel a bit lighter. For most of us, it's nothing to worry about, just a day to take things at a normal, unhurried pace.

If you have young children or are an older adult, or if you or someone in your home deals with asthma or any kind of breathing or heart trouble, just take it a little easier today. There's no need to cancel plans, but maybe choose a quiet walk in the shade over a strenuous workout, and keep any windows closed if you're sensitive to the stuffy feel.

The main thing is not to overthink it. The air is simply a bit thick today, like a warm blanket over the city, and it will likely clear as the day goes on. Just listen to your body, take it easy, and you'll be just fine.