“I thought it was just a bit of haze”: why hill repeats above AQI 100 push particles all the way down into your alveoli
When you push hard on a hill repeat during hazy conditions, your breathing rate skyrockets and your mouth takes over from your nose’s natural filtration. This deadly combination allows fine particles to penetrate deep into your alveoli—the very place where your lungs exchange oxygen. Learn what the science reveals about exercise, pollution, and lung damage.