The U.S. currently produces ten million metric tons of hydrogen annually. As with other gases—natural gas and propane—safety precautions for hydrogen have been in place for decades. Hydrogen’s properties include having a wide flammability range, being non-toxic, colorless, and odorless—all of which are factors in how hydrogen handling systems are designed. Higher pressures in hydrogen vehicles and fueling stations call for enhanced safety precautions, such as communication from the vehicle to the station, along with sensitive leak detection and monitoring. Tens of thousands of fills have safely taken place over the past 15+ years.

Hydrogen, like all fuels, presents inherent hazards that must be understood and managed. Key safety considerations include:

• Flammability: A wide flammability range in air and very low ignition energy, meaning it can ignite more easily than many common fuels.
• Leak potential: A small molecular size that allows hydrogen to escape through small openings and fittings more readily than other gases.
• High stored energy: When compressed or stored as a cryogenic liquid, hydrogen systems contain significant energy that must be properly controlled.
• Invisible flame: Hydrogen flames can be nearly invisible in daylight and emit low radiant heat, complicating detection.
• Material effects: In certain conditions, hydrogen can cause embrittlement in metals and degradation in some polymers.

Importantly, hydrogen is not new. It has been used safely in industrial applications for over a century, supported by established engineering practices, operational controls, and regulatory frameworks. What is new is its expansion into broader energy, transportation, and distributed applications, bringing hydrogen into environments and communities that may be less familiar with its properties.

Mitigation strategies already exists to manage these risks, including:

• Hazard analysis: Conducting thorough risk assessments early in design and throughout operations.
• Proper siting and separation distances: Locating equipment to reduce exposure to people and adjacent infrastructure.
• Ventilation: Designing systems to prevent hydrogen accumulation and keep concentrations below flammable limits.
• Leak detection: Installing fixed and portable gas detectors, along with pressure and flow monitoring systems.
• Flame detection: Using UV/IR or infrared technologies to identify otherwise hard-to-see hydrogen flames.
• Emergency shutdown and isolation: Incorporating automatic systems to stop flow and limit release duration.
• Material selection: Choosing metals and polymers compatible with hydrogen service to prevent embrittlement and degradation.
• Codes, standards, and training: Applying established regulatory frameworks and ensuring operators and first responders are properly trained.

Hydrogen’s properties should be respected, but not feared. Every fuel carries inherent risks, and society has learned to manage those risks through thoughtful design, robust regulation, and operational experience. Hydrogen requires specific controls tailored to its unique characteristics, yet its behavior is well understood and can be managed effectively with a rigorous, engineering-based approach. Clear communication, knowledge sharing, and a strong safety culture are essential to ensuring that isolated incidents do not distort public perception or hinder progress.

There are many online and training resources available to help those working with hydrogen. A few highlighted examples include:

• H2Tools.org – A resource from the U.S. Department of Energy and Pacific Northwest National Laboratory offering data, incident lessons learned, technical references, and safety planning tools.
• Hydrogen Safety Considerations for California – A hydrogen safety report for the public and policymakers reviewing key safety considerations across various hydrogen production methods and applications.
• Hydrogen Safety Panel – Offers contracted expert reviews of hydrogen installations and emerging safety issues.
• Center for Hydrogen Safety eLearnings, Webinars, and Fundamentals of Hydrogen Safety Credential – A series of educational resources for those looking to boost their fundamental knowledge of hydrogen safety.