Final answer:
When purging a piping or tubing system outdoors, it is necessary to follow EPA regulations that detail permissible pollution levels and required pollution-control technologies. Compliance with local zoning laws and ensuring proper ventilation are also important.
Step-by-step explanation:
When a piping or tubing system is to be purged outdoors, it must follow certain regulations to ensure environmental safety. The correct answer to this question is a) Follow EPA regulations. The Environmental Protection Agency (EPA) mandates that companies adhere to specific rules regarding emissions, which aim to control the amount of pollution released into the environment. These regulations are a part of command-and-control regulation, whereby the allowable quantities of pollution and required pollution-control technologies are detailed, leading firms to account for the social costs of pollution. Additionally, since the purge will occur outdoors, it may also be necessary to comply with local zoning laws, and proper ventilation should be implemented to disperse any harmful substances released during the purging process.