As a principal wellspring of sustenance for over a portion of the total populace, rice is by a long shot one of the main business food crops. Its yearly yield overall is around 535 Mt. In Egypt, after the collect of rice each pre-winter (October-November), Egyptian ranchers produce around 30 Mt of rural squanders each year and begin consuming something like 4 t of roughage in an extremely brief time frame to set up their property for the following season. Naturalists fault the consuming of rice straw, for the pall of smoke known by "Dark Cloud", a mass of dirtied air, which spreads across Cairo and the Nile valley for a very long time and transforms the capital's now poisonous air into a considerably more harmful blend. Dark cloud is contained a blend of unpredictable natural mixtures, cancer-causing substances, sulphur oxides, nitrogen oxides and furthermore imperceptible gases like carbon monoxide. It is answerable for around 42% of fall air contamination.
