Type of area | Permissible limit for noise intensity decibel | |||||
Day | Evening | Night | ||||
(7 am - 6 pm) | (6 - 10 pm) | (10 pm - 7 am) | ||||
From To | From To | From To | ||||
Commercial, administrative and downtown areas | 55 | 65 | 50 | 60 | 45 | 55 |
Residential areas in which can be found some workshops or commercial establishments or located on a main road | 50 | 60 | 45 | 55 | 40 | 50 |
Residential areas in the city | 45 | 55 | 40 | 50 | 35 | 45 |
Residential suburbs with low traffic | 40 | 50 | 35 | 45 | 30 | 40 |
Residential rural areas, hospitals and gardens | 35 | 45 | 30 | 40 | 25 | 35 |
Industrial areas (heavy industries) | 60 | 70 | 55 | 65 | 50 | 60 |