France, Ile de France, Paris, Aerial view over city and river through thick smog.

Environment, Air, Pollution, Sign asking motorists to switch of engines at railway level crossing.

Environment, Air, Pollution, Air quality monitor at busy traffice intersection.

Environment, Air, Pollution, City skyline with heavy smog in Santiago, Chile.

England, London, Canary Wharf, View over the City of London from Canada Tower in a haze of smog at dawn.

Russia, Moscow, Thick smoke from industrial chimneys hanging over the city at sunset.

View of Hollywood sign from Hollywood Bowl. Smog visible.Valley & Pasadena American Destination Destinations North America Northern United States of America Air Pollution Environment Environmental Gr...

Aerial view from Canary Wharf over the River Thames towards the Thames Barrier in the early morning city smog

Onion dome roof of the Kremlin with smoke billowing from power station chimneys behind.air pollution smog

Smoke billowing from power station chimneys behind residential housing.air pollution smog

Greece, Central, Athens, Cityscape and smog.

Woman on moped wearing a scarf over her nose and mouth to protect against the smog