(Translated by https://www.hiragana.jp/)
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No, Cracking the Windows Does Not Make Parked Cars Safe for Dogs

On a 70-degree day, the temperature inside a parked car can soar to 99 degrees in 20 minutes. On a 90-degree day, it can hit 109 degrees in 10 minutes. That’s enough time for animals to sustain brain damage or die of heatstroke. Research shows that parking in the shade with the windows cracked makes almost no difference.