worker scientist wearing protective coverall and gas mask doing ecological tests the roof |
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| navigate by keyword : air analysis biochemist biological biology biotechnologist building chemical chemistry coverall danger disaster doctor ecologist ecology environment epidemic examine experiment expertise human laboratory measuring nature one planet pollution professional protection protective purity quality radiation railing research researcher roof science scientific scientist smog smoke suit test top toxic uniform urban |
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| Square snapshot of a man scientist wearing white coverall and gas mask, standing on the roof of an urban building with his back to a rising sun, concept of air pollution |
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