To support accuracy and transparency, the following sources were used in the preparation of this report. These include legislative records, policy research organizations, and government resources.

State Legislation & Government Sources

• Tennessee Geoengineering Ban (2024)
  Overview of the first enacted state-level prohibition on atmospheric intervention.
  https://srm360.org/news-reaction/us-states-consider-bills-to-ban-geoengineering/
• Florida Senate — Weather Modification / Geoengineering Bill Summary
  Official legislative summary outlining enforcement provisions and penalties.
  https://www.flsenate.gov/Committees/BillSummaries/2025/html/56
• Pennsylvania Clean Air Preservation Act (SB508)
  Proposed legislation addressing geoengineering and atmospheric experimentation in Pennsylvania, introduced by Doug Mastriano.
  https://senatormastriano.com/cleanair/
• South Carolina Atmospheric Intervention Bill (2025–2026 Session)
  Proposed restrictions on intentional atmospheric release of substances.
  https://www.scstatehouse.gov/sess126_2025-2026/bills/3915.htm
• Texas Weather Modification Proposal (SB1154)
  Legislative tracking of proposed limits on government involvement in atmospheric activities.
  https://legiscan.com/TX/text/SB1154/id/3108039

Policy Research & Legislative Tracking

• SRM360 — U.S. Geoengineering Legislation Tracker
  Independent research hub tracking state-level proposals and policy trends across the U.S.
  https://srm360.org/us-bans/
• Carnegie Endowment for International Peace — U.S. Policy Analysis
  Research on the political and policy landscape surrounding geoengineering and climate intervention.
  https://carnegieendowment.org/research/2025/11/united-states-geoengineering-carbon-removal-bipartisan-backlash
• Iowa Capital Dispatch — Legislative Coverage
  Reporting on Iowa’s proposed ban on weather-altering activities.
  https://iowacapitaldispatch.com/2026/01/26/iowa-senators-advance-ban-on-geoengineering-weather-altering-activities/

Scientific & Federal Context

• Harvard University — Salata Institute (Public Understanding of “Chemtrails”)
  Academic perspective on public perception and scientific consensus regarding atmospheric claims.
  https://salatainstitute.harvard.edu/understanding-and-addressing-chemtrails/
• U.S. Environmental Protection Agency (EPA) — Geoengineering FAQ
  Federal overview of geoengineering concepts, including contrails and atmospheric science.
  https://www.epa.gov/geoengineering/frequent-questions

Note to ReadersThis topic continues to evolve. Legislative activity is ongoing, and interpretations vary across scientific, political, and public communities.
We encourage readers to review primary sources directly and stay informed as policies develop.

Cloud Seeding Sources

Map Activity Sources

Sources — Cloud Seeding (How It Works)National Oceanic and Atmospheric Administration (NOAA) — Weather Modification & Cloud Seeding Overview
https://www.noaa.gov/education/resource-collections/weather-atmosphere/weather-modification

U.S. Geological Survey (USGS) — Cloud Seeding Explanation
https://www.usgs.gov/special-topics/water-science-school/science/cloud-seeding

Desert Research Institute — Cloud Seeding Research & Process
https://www.dri.edu/cloud-seeding-program/

North American Weather Modification Council (NAWMC) — How Cloud Seeding Works
https://www.nawmc.org/faq/

World Meteorological Organization (WMO) — Weather Modification Statement
https://public.wmo.int/en/resources/bulletin/weather-modification

U.S. Environmental Protection Agency (EPA) — Geoengineering & Atmospheric Science Basics
https://www.epa.gov/geoengineering

Cloud seeding is a documented weather modification method that enhances precipitation in existing clouds by introducing particles such as silver iodide, salt, or dry ice. It does not create clouds from clear skies, and results vary depending on atmospheric conditions.

Sources — Cloud Seeding Map & U.S. ActivityConfirmed Active States (Most Important Source)

• U.S. Government Accountability Office (GAO) / summarized reporting
  States with active programs include:
  California, Nevada, Idaho, Utah, Wyoming, Colorado, New Mexico, Texas, North Dakota

Federal Tracking & Oversight

• National Oceanic and Atmospheric Administration (NOAA) — Weather Modification Reporting
  https://library.noaa.gov/weather-climate/weather-modification-project-reports
  ✔ Confirms:
  • Cloud seeding is a recognized weather modification activity
  • Activities are reported to the federal government under law 

Scientific / Government Context

• U.S. Environmental Protection Agency (EPA) — Geoengineering Overview
  https://www.epa.gov/geoengineering
  ✔ Confirms:
  • Cloud seeding programs are primarily run at state/local levels
  • Active programs exist in multiple U.S. states

Active Program Examples (Real Projects)

• Desert Research Institute — Cloud Seeding Operations
  https://www.dri.edu/cloud-seeding-program/
  ✔ Shows:
  • Active programs in California, Nevada, Colorado
  • Ongoing winter snowpack enhancement projects 

Project Listings Across States

• Weather Modification Project Listings (multi-state programs)
  ✔ Includes projects in:
  • Nevada
  • New Mexico
  • North Dakota
  • Texas
  • Oklahoma
  • California 

Additional Scientific Context

• Cloud seeding has been used in the U.S. since the 1940s, primarily to:
  • Increase precipitation
  • Support water supply and snowpack 

Optional Line for Under Your Map (Highly Recommended)States shown reflect publicly documented cloud seeding programs based on federal reporting, research institutions, and state-level operations. Activity may vary by year, funding, and weather conditions.

• There is no single official “live” federal map
• Data comes from:
  • NOAA reporting
  • GAO summaries
  • State and research program records
• Programs can be:
  • Seasonal
  • Regional
  • Or intermittent

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