black smoke comes from chimney of a house against gray sky heating with coal in winter. environmental problem of smog in Beskid Mountains Zywiec Krakow. heating system needs to be
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- 大图:6000 × 4000 像素·50.8 cm × 33.87 cm·300dpi·JPG
- 中图:1000 × 667 像素·35.28 cm × 23.53 cm·72dpi·JPG
- 小图:500 × 334 像素·17.64 cm × 11.78 cm·72dpi·JPG