Survey on Households and the Environment 
Classification by characteristics of the reference person
Percentage of dwellings whose residents have suffered problems with noise in their surroundings, by level of studies completed by the reference person and cause, and that have taken some measure
Units: %  over the total number of dwellings

	With a noise problem	Due to overland traffic	Due to air traffic	Due to neighbours	From animals	Mechanical causes (including construction)	Due to trade and recreational activities	Due to informal urban get-togethers (outdoor drinking)	Other causes	Have taken some measure against noise (*)	
TOTAL	25.1	11.7	1.9	8.9	2.8	7.3	3.5	2.8	1.5	31.0	
Without studies	16.3	7.7	0.8	5.6	1.5	3.0	1.7	1.8	0.7	22.8	
Primary education or the equivalent	21.5	9.7	1.6	7.0	2.3	5.3	2.8	1.9	1.3	29.4	
Stage one secondary education	25.9	11.9	1.2	8.6	2.6	7.5	3.1	1.9	1.3	29.5	
Upper-secondary education	29.4	14.1	2.7	10.7	3.4	9.3	4.5	3.5	1.6	32.1	
Intermediate level-professional education	28.6	13.4	3.0	11.0	4.3	9.4	3.9	4.0	1.6	33.4	
Higher level -professional education	30.5	14.2	1.9	10.6	4.3	10.3	3.9	3.7	2.7	31.3	
1st cycle university studies	30.8	14.4	2.7	11.9	3.2	10.4	4.3	4.7	2.0	37.7	
2nd or 3rd cycle university studies	32.0	15.2	2.5	12.7	3.9	10.9	6.1	4.4	2.7	34.4	
Does not know/ Does not answer	21.9	21.9	.	.	.	21.9	21.9	.	.	.	
Notes:

.Data protected by statistical secrecy

1) (*) % over the total number of dwellings with noise problems
Source: National Statistics Institute