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Table 5 Carcinogenicity classifiations and exposure sources of light-at night and radiation

From: State of the evidence 2017: an update on the connection between breast cancer and the environment

Exposure IARC NTP Use
Shift Work, Light-at-Night PR   Shift work or ambient light pollution
Ionizing Radiation K K Diagnostic medical tests; nuclear medicine procedures; nuclear power plants, research protocols
Non-ionizing radiation (electromagnetic fields)    Lighting, computers, cell phones and other electronic sources
  1. International Agency for Research on Cancer (IARC) classifications: 1 = Carcinogenic to humans, 2A = Probably carcinogenic to humans, 2B = Possibly carcinogenic to humans, 3 = Not classifiable as to its carcinogenicity to humans; U.S. National Toxicology Program (NTP) classifications: K = Known to be a human carcinogen, RA = Reasonably anticipated to be a human carcinogen. Source of exposure list contains most common exposure sources