Survey on Households and the Environment Classification by characteristics of the reference person Percentage of dwellings whose residents have suffered problems with odours in their surroundings, by level of studies completed by the reference person and cause, and which have taken some measure Units: % over the total number of dwellings ,With an odour problem,Due to smoke, tobacco etc.,Pipelines, sewerage, etc, ...,Farms,Industries (food, fishing, workshops, etc,...),Trade (supermarkets, fishmongers, etc.),Litter bins,Dumps,Other causes,Have taken some measure against odours (*), TOTAL,20.3,1.2,11.6,2.8,1.7,0.6,1.8,0.9,3.4,29.1, Without studies,15.4,0.6,8.3,2.5,1.6,0.2,1.7,0.3,2.5,26.4, Primary education or the equivalent,18.8,1.0,9.9,3.0,1.8,0.4,1.6,0.7,3.2,24.7, Stage one secondary education,23.8,0.7,13.4,3.8,2.1,0.5,2.5,1.2,3.2,30.2, Upper-secondary education,21.6,1.1,13.1,2.5,1.4,1.0,2.2,1.5,3.1,29.4, Intermediate level-professional education,22.9,1.3,14.0,3.2,1.7,0.3,2.2,1.4,3.9,29.1, Higher level -professional education,27.1,3.2,14.9,3.4,1.4,0.8,1.9,1.0,5.9,34.4, 1st cycle university studies,21.2,1.2,12.6,2.0,1.6,0.6,1.3,1.0,3.2,33.1, 2nd or 3rd cycle university studies,20.1,2.1,13.2,1.5,1.7,1.0,1.4,1.2,4.1,35.0, Does not know/ Does not answer,21.9,.,21.9,21.9,.,.,.,.,.,., Notes: .Data protected by statistical secrecy 1) (*) % over the total number of dwellings with odours problems Source: National Statistics Institute