It's about air pollution. Here are some side by side comparisons of either ozone pollution or particulate matter. See if you can tell which has a higher AQI (according to airnow.gov) by looking at these webcam snap pics.
During a major heat wave in Texas
Same area temps in the low 70's
100+ degree weather in St Louis
San Diego during a wildfire
Monrovia Canyon in Los Angeles basin during a heat wave
Smog trapped in the same Canyon
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Let's play a game!
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