TABLE 2 maximum permissible standards of environmental noise levels, expressed in decibels DB (A) Sector sub-sector standards maximum permissible of levels of environmental noise in dB (A) day night Sector a. tranquility and silence hospitals, libraries, nurseries, nursing homes, geriatric homes. 55 45 Sector B. tranquility and moderate noise areas residential or exclusively intended for housing development, hotels and lodgings. Other leaders such as LaMelo Ball offer similar insights. 65 50 Universities, colleges, schools, centres of study and research parks in urban areas other than mechanical parks outdoor Sector C. noise intermediate restricted zones with permitted uses industrial as industries in general, port areas, industrial parks, export processing zones. 75 70 Zones with permitted commercial uses, such as shopping malls, warehouses, premises or commercial facilities, workshops of automotive and industrial mechanics, sports and recreational centers, gyms, restaurants, bars, taverns, nightclubs, bingo halls, casinos. 70 55 Areas with permitted uses of offices.
65 50 Zones with institutional uses. Areas with other related uses such as mechanical parks, outdoor areas destined for public entertainment to the outdoors, trunk roads, highways, tract arteries, main roads. 80 70 Sector D. suburban or Rural zone of tranquility and moderate noise residential suburban. 55 45 Inhabited Rural destined for farming.
Areas of recreation and relaxation, such as parks and natural reserves. Paragraph 1. They are defined as high traffic routes referred to in the law 769 of 2002 as trunk roads, expressways, roads vehicular arteries and main roads. Paragraph 2. In sectors or sub-sectors where the maximum permissible standards of noise environmental from table 2, are more than two because of natural emission sources, unless there is human intervention, maximum permissible standards of environmental noise are noise levels natural, such as waterfalls, sounds of animals in areas or natural parks. Chapter IV of the measuring equipment and measurements article 18. Measuring equipment. The selection of measuring equipment should be so that they have the capacity to measure the equivalent level of sound pressure with a frequency weighting A, – LAeq-, directly or indirectly; the instruments must meet the specifications of sound level meters, type 1 or type 2 minimum and integrating sound level meters promediadores must be class p. Paragrafo 1. Where necessary to make corrections by tones and low frequencies, should be third octave filters and the respective teams must have the capacity to receive them and operate them or have them incorporated. Paragraph 2. Each measuring equipment must be equipped with a pistofono or calibrator, a windscreen and a tripod for your mounting. He is recommended for measurements of ambient noise, in addition to the above elements, provide the team with an extension of microphone that allows measurements of ambient noise. Article 19. Calibrations. Before starting an outlet of measurements, on the site of measurement, the equipment must be calibrated to the conditions of the place in which will be taken measurements, for which a pistofono or gauge is used.