An explosion of unknown cause occurred at a hydrogen manufacturing plant. The explosion occurred on the second floor of the building, used by employees as a cafeteria and offices. The company where the accident occurred mainly produces industrial hydrogen gas and supplies it in cylinders and trailers, as well as through pipe-line. The building was damaged and three people were seriously injured. The explosion shook the ground and caused nearby workers to evacuate.

A hydrogen safety sensor went into alarm at a hydrogen demonstration facility. The early morning temperature was near freezing and there was a trace of precipitation on exposed surfaces. Upon further inspection following the sensor alarm, a 3,500 psig (approximately 24 MPa) stationary storage vent was found to be releasing hydrogen through the PRD vent stack (PRD = Pressure Relief Device). The alarming sensor was at an adjacent building but responded to hydrogen 20 yards (18 m) downwind from the vent location. The vent release location is 10 feet (3 m) above ground level.

A researcher was conducting an experiment that involved sawdust being heated at pressure using hydrogen gas in an laboratory-scale autoclave.The gas leaked from the autoclave during the experiment and ignited, causing injuries to the scientist (cuts, bruises and facial burns).The explosion caused extensive damage to the building, propelling debris more than 20 metres into a garden area.

An explosion occurred while inflating a balloon with hydrogen gas. The News reported the involvement of the hydrogen bottle.

Around 60 people gathered in a small theatre at a shopping centre to watch an array of scientific experiments, including a "small hydrogen explosion."Several children suffered second degree burns with children aged between five and 13 rushed to the nearest hospital.It remains unclear which chemicals were used in the experiments, with some reports claiming both hydrogen and alcohol-based chemicals were used.However a statement released by the Russian investigative committee examining the case said the science show had used "liquid nitrogen".The "flammable" substance was then ignited by the gas

The hydrogen possible leaked and ignited from a tank which was inside a car parked in a hospital underground parking garage. The tank was supposed to be used for launching a weather balloon. Two people were injured and are being treated in the Emergency Department. The explosion damaged at least three other cars in the parking garage.The cause is under investigation by Detroit police and fire. The parking garage does not appear to have sustained any structural damage.

At least one person was injured in an explosion at a theatre building. The investigation concluded that the accident has been caused by hydrogen entering the sprinkler room from the sprinkler piping, during maintenance of the building's sprinkler system. Together with indoor air, it formed a flammable mix of hydrogen gas and air. it is known that hydrogen forms in pipes due to corrosion of the pipe internal zinc coating by oxygen and water. The investigation could not identify the exact cause of the ignition.

A lorry loaded with gaseous hydrogen cylinders caught fire and shut a motorway.No one has been injured.

The explosion and fire happened in a diesel hydro-treatment unit used to desulfurise raw diesel be means of hydrogen.The facility was expected to begin full commercial operations later in 2020.

A hose of a hydrogen tanker parked in at a specialised company ruptured. The released hydrogen ignited and exploded, followed by a fire probably fed by the continuously leaking hydrogen. The local fire rescue team rushed to the scene after receiving the alarm call. The fire was quickly brought under control and extinguished. Firefighters continued to cool the tank to avoid further problems. There were no casualties at the scene. There were two hydrogen trailers parked at the accident site. The other truck was not affected.