Hydrogen Gas Protects Lungs from Air Pollution Damage in Rats
Hydrogen ameliorates lung injury in a rat model of subacute exposure to concentrated ambient PM2.5 via Aryl hydrocarbon receptor
Research hubs: Respiratory System
This research was done in animals. Results in animals often don't carry over to people.
- Evidence type
- Animal study (rat)
- Authors
- Shan Feng, Erhong Duan, Xiaojuan Shi, Huiran Zhang, Haitao Li, Yunxia Zhao, Lingshan Chao, Xiaoqian Zhong, Weiwei Zhang, Rongqin Li, Xixin Yan
- Journal
- International Immunopharmacology
- Year
- 2019
- PMID
- 31718930
- Study Type
- Rat
- Delivery
- Gas
- Dose
- 66.7% hydrogen inhalation for 2 hours after each exposure to CAPs or filtered air, 5 days/week for 4 weeks
- H₂ concentration
- 66.7% hydrogen
- Duration
- 4 weeks
- Outcome
- Positive
- Peer Reviewed
- Yes
- Cited by
- 36 (OpenAlex, as of November 2026)
- Country
- China
TL;DR
Breathing in high concentrations of hydrogen gas can reduce lung damage caused by exposure to fine air pollution particles in rats.
Key Finding
Hydrogen gas inhalation significantly reduced lung damage, inflammation, mucus production, and oxidative stress in rats exposed to concentrated air pollution (PM2.5).
Summary
Researchers exposed rats to high levels of air pollution (fine particles called PM2.5) and found that it damaged their lungs by causing inflammation, mucus buildup, and oxidative stress (cellular damage from unstable molecules). When the rats inhaled hydrogen gas for 2 hours after each pollution exposure, these harmful effects were significantly reduced. The study suggests hydrogen may work by affecting a protein called the aryl hydrocarbon receptor, which is involved in how cells respond to pollution.
Practical Takeaway
This rat study provides early evidence that hydrogen gas may help protect lungs from air pollution damage, but results from animal studies do not automatically apply to humans. Much more research, including human trials, would be needed before hydrogen could be considered a treatment for pollution-related lung problems. The study also used very high hydrogen concentrations (66.7%) delivered by inhalation, which differs from hydrogen water products available to consumers.
Abstract (excerpt)
Background: Ambient fine particulate matter (PM2.5) could induce lung injury. Aryl hydrocarbon receptor (AhR) is involved in the molecular mechanisms of prooxidative and pro-inflammatory effect of PM2.5. Molecular hydrogen has antioxidant properties. The protective effect and mechanism of hydrogen…