Temporal trends in satellite-derived erythemal UVB and implications for ambient sun exposure assessment

摘要: Ultraviolet radiation (UVR) has been associated with various health outcomes, including skin cancers, vitamin D insufficiency, and multiple sclerosis. Measurement of UVR difficult, traditionally relying on subject recall. We investigated trends in satellite-derived UVB from 1978 to 2014 within the continental United States (US) inform exposure assessment determine potential magnitude misclassification bias created by ignoring these trends. Monthly data remotely sensed NASA satellites were used investigate changes over time using linear regression a harmonic function. Linear models for local geographic areas make inferences across entire study area global field significance test. Temporal all years separately each satellite type due documented differences estimation. increased 48% tests. The largest increase was found Western Nevada (0.145 kJ/m2 per five-year increment), total 30-year 0.87 kJ/m2. This change only represented 17% ambient an average January 2% July Nevada. observed represent cumulative less than month, which are not relevant when attempting estimate human exposure. observation small should be interpreted caution measurement parameter inputs (ozone climatological factors) that may impact derived nearly 20% compared ground level sources. If hold, reasonably exposures even outcomes long latency phases predate record.