Assertion: nitrogen dioxide | /r/Causes | eye and nose irritation
Facets:
value: at 10 to 20 ppm
type: OTHER
Source sentences:
text: Nitrogen dioxide (and/or its dimer, nitrogen tetraoxide) is rust red and has a "typical" odor quite notable at 5 ppm and causes eye and nose irritation at 10 to 20 ppm.