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Chicago and Cincinnati had been the first two American cities to enact laws making certain cleaner air in 1881. As historian Martin Melosi notes, the era that first saw automobiles changing the horses noticed automobiles as "miracles of cleanliness". By the Forties, nevertheless, automobile-caused smog was a major problem in Los Angeles. , using coal for fuel brought on considerable air air pollution, and the conversion of coal to coke for iron smelting starting in the 17th century exacerbated the problem. In Europe, from the Middle Ages well into the early modern period, unsanitary urban situations favoured the outbreak of population-decimating epidemics of illness, from plague to cholera and typhoid fever. Through the 19th century, water and air pollution and the accumulation of solid wastes were largely issues of congested city areas. In reality, a whopping 78% of B2C firms rely upon user-generated content for his or her advertising campaigns. You can sign up as a creat