Final answer:
Yes, using LPG in equipment designed for natural gas is prohibited in New York City unless authorized by the commissioner on an emergency basis. Safety regulations govern the use of alternative fuels like LPG to mitigate risks.
Step-by-step explanation:
The correct answer to whether the storing, handling, or use of LPG in any equipment used or previously used for natural gas is prohibited in New York City except as may be authorized by the commissioner on an emergency basis is a) Yes. Regulations concerning the use of fuels such as LPG (liquefied petroleum gas) and LNG (liquefied natural gas) are typically stringent, especially in dense urban environments like New York City for safety reasons. Propane, a type of LPG, is often used as a substitute for natural gas in remote locations where pipeline infrastructure is lacking. However, the repurposing of natural gas equipment for LPG use can pose safety risks if not properly approved or managed. Therefore, such changes would likely require specific authorization to ensure compliance with safety standards and regulations.