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'''Noxious substances''' are those [[substance]]s which in some form are injurious or very [[harmful]] to living beings, usually when [[ingestion]] occurs.
'''Noxious substances''' are those [[substance]]s which in some form are injurious or very [[harmful]] to living beings, usually when [[ingestion]] occurs, such as [[carcinogen]]s, [[mutagen]]s or [[teratogen]]s.
[[category:environment]]
[[category:environment]]