Housing conditions and energy efficiency Households suffering from certain household and surroundings issues by income quintile per unit of consumption. Unidades: Percentages. ,Little natural light,Noise from the neighbourhood or outside,Pollution and other environmental issues,Delinquency or vandalism,No issues, Total,8,6,24,10,7,13,8,62,1, First quintile,11,3,25,6,11,6,16,4,58,6, Second quintile,10,2,25,2,10,4,13,7,59,6, Third quintile,8,6,24,11,1,14,6,62, Fourth quintile,7,5,24,6,10,7,13,62,2, Fifth quintile,5,7,20,7,9,5,11,3,67,7, Notas: Income per unit of consumption is obtained, for each household, by dividing total household income by the number of units of consumption. The distribution of persons is taken. Fuente: Instituto Nacional de Estadística