Daytime light exposure

1. Daytime light exposure lowers the risk of chronic obstructive pulmonary disease in humans (HR 0.72 [0.60, 0.88]).

   “Compared with the lowest exposure group (0-50%), brighter day light exposure was associated with a lower risk of COPD (50-70%: HR [95% CI], 0.88 [0.77, 0.99]; 70-90%: 0.82 [0.71, 0.95]; 90-100%: 0.72 [0.60, 0.88]).”

   Humans90-100% vs 0-50% light intensity percentilen = 86,080

   Independent and interactive effects of personal light exposure and air pollution on incident COPD: A prospective cohort study with 13 million hours of light sensor data

   Environmental pollution (Barking, Essex : 1987)·7 Jul 2026

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