This creates dense smog in urban areas, for example, in London, England during the Victorian era.

Officials urged people with respiratory problems to avoid strenuous outdoor activity as the dense smog that has covered the city this week grew even darker, obscuring views of the famous harbor and Peak.

This was before the main reading room was restored, when the atmospheric scenes in the ceiling panels were still blighted, by what appeared to be dense smog, when the ornamental woodwork seemed almost gouty with wax buildup.

The only moon with a thick atmosphere (mostly nitrogen, like our own), it is perpetually shrouded in dense smog, which has long obscured our view.

A dense smog fills Titan's sky and obscures the surface.

It was suspected that the crash may have been due to either disorientation or engine failure caused by local dense smog resulting from forest fires.

The town in North Bohemia, one of Europe's most environmentally devastated regions, declared an emergency last Friday after being engulfed in dense, sulphurous smog for days.

However, it was bad, and Penny, driving in to school alone for the first time (the two other girls coincidentally had other business), found herself caught in dense smog.

The cameras and radar penetrated the dense smog enough to reveal a patchwork of light and dark surface features, but no details.

Even in the dense smog, Bo's skin was as clear as a baby's.