Trend of household composition and environmental impact

The demographic dynamic in countries with low fertility rates and falling mortality rates has contributed to the aging of the population structure, for the modification of the household composition and ownership of vehicles. In 2010 Brazil and South Korea occupied similar positions in world production of vehicles but the rates of inhabitants per vehicle corresponded to 6.1 and 2.7 respectively. Between 2000 and 2010, the increase in number of households was two times larger than the increase in the number of people in Brazil and 5 times greater in South Korea, which had large percentage of households consisting of one single person. The number of households increased by 21% in Brazil and 28% in South Korea but the vehicular fleet increased 60% and 39% respectively. One consequence is the increased concentration of the pollutant ozone in the atmosphere due to vehicular emission. Between 2000 and 2007, the record of high ozone concentration increased from 52 to 79 in Korea and 35 to 66 in one of the largest cities in Brazil.