Yes, hydrogen sulfide is poisonous and can kill quickly. Many oil field workers keep H2S monitors on them to alert them to high levels of the gas, which has a strong smell similar to rotten eggs.

Regulators do little to stop them. Hydrogen sulfide, H2S, is an invisible gas that smells of rotten eggs and that comes up with the oil that’s produced in large swaths of Texas. Highly corrosive ...

Fujifilm has issued firmware updates for the following cameras: X-T5, X100VI, X-H2, X-H2S, X-T50, X-M5, GFX100S and GFX100, ...