The bill H.217, titled the Vermont Clean Air Preservation Act, aims to prohibit various forms of geoengineering, including solar radiation modification, cloud seeding, and other atmospheric interventions that may harm health, the environment, or agriculture. It establishes a new chapter in Vermont law dedicated to geoengineering, defining key terms such as "atmospheric activity," "geoengineering," and "pollutant." The bill mandates that any suspected violations be reported to the Vermont State Police or local sheriffs, who are empowered to issue cease-and-desist orders and enforce compliance.

Additionally, the bill outlines penalties for individuals or entities engaging in prohibited activities, classifying such actions as felonies with fines up to $50,000 or imprisonment for up to two years. It also includes provisions for training Vermont citizens to assist in enforcement and requires independent evaluations of communications infrastructure related to radiation levels. The act is set to take effect upon passage, emphasizing the state's commitment to preserving air quality and protecting public health from harmful atmospheric experiments.