the comparison of results from surveys on noise annoyance. This document recommends including two standardized
questions with two standardized response scales in all surveys of long-term noise annoyance. A recently revised version of the TS proposes a weighting procedure for the response data to achieve a better similarity between the results
from the two questions. This paper analyses the results from 43 surveys conducted according to the ISO/TS 15666
recommendations. It is shown that the average difference in the response to the two annoyance questions is equivalent to a 6 dB shift in the exposure level. The proposed weighting of the verbal response whereby response category
5 (extremely) is counted in full, and category 4 (very) is weighted by a factor 0.4 creates a greater similarity between
the two responses. It is important to use a definition of prevalence of high annoyance which matches the one used for
the development of the relevant noise regulations.