Venus is surrounded by a thick atmosphere composed mainly of carbon dioxide and nitrogen, and its clouds are sulfuric acid. The thickness of the atmosphere initially made it difficult to determine why the surface was so hot.

A typical automated airport weather station which records the routine hourly weather observations of temperature, weather type, wind, sky condition, and visibility. These surface stations are located around the world, and are used to derive a global temperature.

The incomplete combustion of biomass during the Yellowstone fires of 1988 near the Snake River introduced a large quantity of black carbon particles into the atmosphere.

Black carbon is found worldwide, but its presence and impact are particularly strong in Asia.

Inefficient gas flare that creates black carbon at a site in Indonesia

Black carbon on a cooking pot. Result of a biofuel cooking.

Air pollution 3