Athens, Greece: Medium shot of six figures of the Erechtheion on the Acropolis Caryatid porch, with smog over the city in the background.

Beijing, China: Various shots of a city covered in smog, showing modern buildings, traffic and pedestrians.

Medium close up of highrise buildings shrouded in smog in Hong Kong. Camera zooms out to reveal a Chinese pagoda.

Close view of smoke coming out of top of industrial chimney, next to tower block against orange sky

London, England: Grey smoke billowing across the sky above St Paul's Cathedral.

A Dirigible (airship) catches fires in midair and plummets to earth.

Two shots showing lines of cars and lorries slowly moving towards camera in traffic queue on motorway/freeway in Los Angeles through slight haze

Shot of several explosions on the ground. Smoke clouds rise up into the sky.

Manila, Philippines: Various shots of the slightly smoggy Manila cityscape with residential areas in the foreground and skyscrapers looming beyond.

City of London skyline seen through pink smoggy haze caused by air pollution with Oxo building seen in foreground