The worst ozone days almost always happen on what looks like beautiful summer weather.
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The worst ozone days almost always happen on what looks like beautiful summer weather. Here's why. ͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­͏‌  ­
July 08, 2026

What the Air Quality Index Actually Measures — and Why Summer Is the Worst Season for Your Lungs

The AQI in your weather app converts measurements of five different pollutants into a single number — and on most summer days, the one driving it is ground-level ozone, which forms fastest on hot, sunny, stagnant days. The conditions that produce the worst air quality look exactly like a beautiful summer afternoon.

→ Ozone peaks between 2 and 7 p.m. — morning exercise exposes you to significantly lower concentrations than the same workout in the afternoon

→ Wildfire smoke can produce PM2.5 concentrations that dwarf local emissions — and upper-level winds can carry it thousands of miles from the source

→ Temperature inversions trap pollutants near the surface overnight — AQI often rises fastest in the hours just after sunrise before heating breaks the inversion

PM2.5 particles are small enough to cross from the lungs into the bloodstream — contributing to cardiovascular disease and stroke, not just respiratory effects.

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