According to some embodiments, the present disclosure relates to a wearable UV sensor for detecting certain doses of electromagnetic radiation, the wearable UV sensor comprising: (a) a polymeric substrate comprising at least one polymer and at least one UV radiation exposure indicator; and (b) an adhesive, wherein the wearable UV sensor is exposed to the certain doses of the electromagnetic radiation to produce a change in photochromism in the polymeric substrate. The present disclosure also relates to a method for determining the magnitude of exposure dose of UV radiation. The method comprises the steps of providing a wearable UV sensor comprising a polymeric substrate, a UV radiation exposure indicator, and optionally an adhesive layer; exposing the wearable UV sensor to at least one dose of electromagnetic radiation to form an irradiated wearable UV sensor, wherein the exposure causes a photochromic change through the wearable UV sensor; and determining the at least one dose of electromagnetic according to the magnitude of the radiation.