question: What threats can hydrogen cause to human saftey ?
answer: potential detonations and fires when mixed with air to being an asphyxiant in its pure , oxygen-free form
turker_answer: Hydrogen can cause potential detonations and fires when mixed with air due to it to being an asphyxiant in its pure , oxygen-free form .
rule-based: Hydrogen can cause potential detonations and fires when mixed with air to being an asphyxiant in its pure , oxygen-free form to human saftey .