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Scientist woman checking the fume hood in the laboratory before and after use for safety in the laboratory.
Abstract smoke background. Ink colors blot in water. Blue, white on black.
Male worker was about inspect the container holding chemical ammonia protection mask felt stink and felt dizzy because inhaled toxic fumes chemicals that were toxic to the respiratory system.
Cell culture laboratory experiments at fume hood
Smoke comes out of the exhaust pipe of a car in a parking lot

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