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1. Except as otherwise provided in this article, this article shall not apply to the use or possession of lasers, radioactive material or radiation equipment which are subject to the regulatory powers and jurisdiction of the state department of health or the health department of the city of New York. 2. a. Sections four hundred eighty-two, four hundred eighty-three and subdivision one of section four hundred eighty-four of this article shall not apply to an individual operating a crane or acting as a blaster in a city having a population of one million or more. b. No individual shall operate a crane or act as a blaster in a city having a population of one million or more without holding a valid license or certificate of fitness issued by such city, and such city is hereby authorized and directed to prescribe rules and regulations as described in section four hundred eighty-three of this article. c. No employer, contractor or agent thereof shall knowingly permit any individual to operate a crane or act as a blaster in a city having a population of one million or more unless such individual holds a valid license or certificate of fitness issued by such city.