Worker scientist wearing protective coverall and gas mask doing ecological tests on the roof

Related tags:

• experiment
• scientist
• flask
• chemistry
• science
• chemical
• scientific
• biology
• laboratory
• environmental protection
• air quality
• environment
• air pollution
• pollution
• eco
• disaster
• gas mask
• environmental pollution
• paisaje
• research
• nature
• roof top
• smog
• urban
• roof
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