फ़ैक्टरी, प्रदूषण, सूर्य का अस्त होना, औध्योगिक कारखाना, वातावरण, चिमनी, उद्योग, ईंधन और बिजली उत्पादन, धुआं, भौतिक संरचना, भाप
Public Domain
प्रासंगिक तस्वीरें
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