Still in play

Environmental protection: air pollution; dispersion of substances or objects into atmosphere; prohibit for purposes of affecting weather. Amends 1994 PA 451 (MCL 324.101 - 324.90106) by adding sec. 5514b.

Michigan opts for statutory simplicity by adding a single-sentence prohibition to existing environmental law with no specified penalties, enforcement mechanisms, or implementation framework.

Latest: Committee On Regulatory Reform (since 26 Mar 2025) Unmoved for over a year - unlikely to ever see progress before the session closes at the end of the year.

Prohibits release of certain substances into atmosphere for purposes of geoengineering.

New Jersey's bill takes a distinctive approach by limiting its prohibition to "hazardous" substances used for geoengineering rather than banning all atmospheric releases, while creating a citizen science-style monitoring program that accepts everything from smartphone photos to spectrometry reports as evidence of potential violations.

Latest: Senate Environment and Energy Committee (since 13 Jan 2026)

Prohibits release of certain substances into atmosphere for purposes of geoengineering.

New Jersey's bill takes a distinctive approach by limiting its prohibition to "hazardous" substances used for geoengineering rather than banning all atmospheric releases, while also creating a citizen-science-style monitoring program that accepts everything from smartphone photos to spectrometry reports as evidence of potential violations. Introduced as an identical companion bill to S934

Latest: Introduced June 2026 - Awaiting a committee assignment (since 10 June 2026)

Enact the Atmosphere Protection Act

Ohio's "Atmosphere Protection Act" imposes some of the harshest penalties in state weather modification legislation—a mandatory 3-year prison term and a minimum $500,000 fine under strict liability, meaning prosecutors need not prove intent. The Legislative Service Commission's own analysis notes uncertainty about what the undefined term "sunlight reflection methods" actually prohibits.

Latest: Natural Resources Committee (since 21 May 2025)

Regards food dyes, PFAS, fluoride, and certain substance releases

Ohio's HB 272 buries a straightforward prohibition on weather modification within an omnibus consumer protection bill covering PFAS chemicals, food dyes, and water fluoridation. The atmospheric release provision is notably modest compared to Ohio's other pending weather modification bill (HB 290), imposing misdemeanour penalties rather than felony charges, suggesting different legislative philosophies on enforcement severity even within the same chamber.

Latest: General Government Committee (since 14 May 2025) Unlikely to proceed

Prohibiting solar radiation modification or sunlight reflection methods, cloud seeding and polluting atmospheric interventions within this Commonwealth; imposing duties on the Pennsylvania State Police and sheriffs; and imposing penalties.

Pennsylvania's Clean Air Preservation Act creates a sweeping felony prohibition on atmospheric interventions, including solar geoengineering experiments like stratospheric aerosol injection and marine cloud brightening, with the unique feature of listing artificial intelligence as a criminal entity subject to minimum penalties of $500,000 and two years imprisonment per day of violation, enforceable by sheriffs and State Police against any entit,y including federal agencies.

Latest: Agriculture & Rural Affairs (since 21 Mar 2025)

Prohibiting solar radiation modification or sunlight reflection methods, cloud seeding and polluting atmospheric interventions within this Commonwealth; imposing duties on the Pennsylvania State Police and sheriffs; and imposing penalties.

Pennsylvania's Clean Air Preservation Act creates a sweeping felony prohibition on atmospheric interventions, including solar geoengineering experiments like stratospheric aerosol injection and marine cloud brightening, with the unique feature of listing artificial intelligence as a criminal entity subject to minimum penalties of $500,000 and two years imprisonment per day of violation, enforceable by sheriffs and State Police against any entity including federal agencies.

Latest: Environmental & Natural Resource Protection (since 7 Apr 2025)

Clear Skies Act

The federal "Clear Skies Act" (H.R. 4403) bans all weather modification activities nationwide with criminal penalties up to 5 years imprisonment and $100,000 fines per violation, while repealing all existing federal authorities that permit such activities and establishing a public EPA reporting system for suspected violations.

Atmosphere Study Act

A federal study-only bill requiring the Department of Energy to investigate health and environmental effects of federally-connected geoengineering projects, with no regulatory teeth or prohibition provisions—essentially a fact-finding exercise that commits Congress to nothing beyond receiving a report.

Air Quality Act

This federal bill goes beyond simple prohibition by creating dual reporting systems—one requiring airlines to disclose weather modification equipment on aircraft, another for public violation reports—while simultaneously repealing all existing federal weather modification authorities and banning even federally-funded research on atmospheric intervention.