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Why do the 3-hour PSI indications appear lower when the visibility is poor?

April 26, 2017appear lower poor PSI Visibility

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Why do the 3-hour PSI indications appear lower when the visibility is poor?

1 Answer

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When a 3-hour PSI reading is released during the smoke haze periods, it is for air quality for the immediate past three hours. It therefore does not correspond to what you may observe at the point when you hear the PSI announcement.