Thick smog over a big city, illustrating the air pollution problem.
Schlüsselwörter
smog,
pollution,
city,
environment,
urban,
ecology,
health,
emission,
climate,
impact,
air,
skyline,
dirty,
ecological,
crisis,
atmosphere,
planet,
earth,
contamination,
concern,
toxic,
awareness,
degradation,
sprawl,
sky,
carbon,
decay,
issue,
imagery,
horizon,
metropolis,
illustration,
scenery,
global,
symbol,
problem,
haze,
city landscape,
landscape,
concept
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