Acquired Reactive Perforating Dermatosis Last updated July 12, 2017 Reactive Perforating Collagenosis (RPC) is a very rare skin disorder that can manifest during early childhood or adulthood.
Fog is a mixture because it is an aerosol of water droplets or ice crystals in air. Fog can also contain molecules of acids or ammonia. Continue Reading
Smog can harm health, damage the environment and cause poor visibility.   Smog is a combination of fog and pollution. The common cause of a widespread thick fog is a temperature inversion. If there is a significant source of pollution under the inversion, it gets trapped along with the fog.