Typeofregions

Daytime dB (A)

Nighttime dB (A)

Farmsandranches

40

35

Strictly urban residential area with hospitals or schools

50

45

Área mista, predominante residencial

55

50

Mixedarea, predominantlyresidential

60

55

Mixed area of commercial establishments and offices

65

55

Predominantly industrial area

70

60

Industrial andservices zone

70

60