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Forestry and logging activities in tropical regions are commonly carried out in inappropriate thermal conditions, due to the hot and humid climate, demanding from the worker high energy expenditure and physical effort. They often operate and handle machines and equipment that produce high levels of noise and vibration, and adopt postures that can be harmful to the body, given the constant lifting, handling and transport of loads above tolerable limits. The objective of this study was to evaluate the exposure of workers to risks in a rainforest harvesting and processing system in northern Mato Grosso State, Brazil. The study was conducted in two forest management areas and four processing industries. Occupational heat exposure was assessed and a qualitative analysis of noise and vibration was performed in the two study areas. Occupational exposure to heat was performed by determining the Wet Bulb Index and Globe Thermometer (IBUTG), while the qualitative analysis of noise and vibration was performed with the application of a Risk Analysis methodology. The results indicate that the values of the wet bulb index and globe thermometer (IBUTG), obtained every hour of the working day in the activities of the timber industry and wood processing, correspond to values above the tolerance limit, as standardized. The condition most likely to be harmful to health was found in the exposure to noise by workers in the wood processing industry, especially in operations related to the logging stages, where the risk was categorized as intolerable. With respect to exposure to vibration, the risk was higher in chainsaw operations in logging. In this case, it was possible to qualitatively analyze which occupational exposure limit (OEL) would be exceeded when the machine was in operation, representing risks to workers’ health and safety. It is concluded that there is a need to adopt control measures, since the risk exposure levels were in a range that poses a risk to workers’ health.
Forest Stewardship Council, FSC Principles and Criteria for Forest Management FSC-STD-01-001 V5-0 EN. 2012;29.
Brazil. Labor Inspection Secretariat. Safety and Occupational Medicine Regulatory Standards. 2019;15:9.
(Accessed 15 September 2019a)
Available:https://enit.trabalho.gov.br/portal/index.php/seguranca-e-saude-no-work/sst-menu/sst-normatizacao/sst-nr-portugues?view = default
Sessions J. Forest road operations in the tropics. New York: Springer-Verlag Berlin Heidelberg; 2007.
Brazil. Labor Inspection Secretariat. Safety and Occupational Medicine Regulatory Standards. NR 15. Unhealthy Activity and Operations. 2019;15:9.
(Accessed 15 September 2019b)
Fundacenter. Occupational hygiene standard: NHO 06: Assessment of occupational exposure to heat. 1st ed. Sao Paulo: Fundacentro; 2001a.
Vale SA. Instruction for occupational hygiene management. N. INS-0055; 2010.
Brazil. Labor Inspection Secretariat. Safety and Occupational Medicine Regulatory Standards. NR 09. Environmental risk prevention program. 2019;15:9.
(Accessed 15 September 2019c)
Fundacenter. Occupational hygiene standard: NHO 01: Assessment of occupational noise exposure. Sao Paulo: Fundacentro. 2001b:40.
Fundacenter. Occupational hygiene standard: NHO 09: Assessment of occupational exposure to full body vibration. Sao Paulo: Fundacentro. 2013a: 63.
Fundacenter. Occupational hygiene standard: NHO 10: Assessment of occupational exposure to vibration in hands and arms. Sao Paulo: Fundacentro. 2013b;53.
Brazilian Association of Technical Standards. ISO 31010: Risk Management - Techniques for the Risk Assessment Process; 2012.
Brazil. Ministry of Health. National Health Council. Resolution no. 196 of October 10, 1996. Approves the guidelines and regulatory standards for research involving human subjects. Brasilia, Official Gazette; 1996.
Brazil. Labor Inspection Secretariat. Safety and Occupational Medicine Regulatory Standards. NR 07. Occupational Health Medical Control Program. 2019;15:9.
(Accessed 15 September 2019d)
Brazil. Labor Inspection Secretariat. Safety and Occupational Medicine Regulatory Standards. NR 06. Personal Protective Equipment -EPI. 2019;15:9.
(Accessed 15 September. 2019d)
Kroemer KHE, Grandjean E. Ergonomics Handbook: Adapting Work to Man. 5th ed. Porto Alegre: Bookman; 2005.
Silveira JCM, Fernandes HC, Rinaldi PCN, Modolo AJ. Noise levels as a function of the distance between different equipment in an agricultural workshop. Engineering in Agriculture. 2007;15(1):66-74.
Tak S, Davis RR, Calvert GM. Exposure to hazardous workplace noise and use of hearing protection devices among US workers - NHANES, 1999 -2004. American Journal of Industrial Medicine. 2009;52(5): 358-371.
Massa CGP, et al. P300 in workers exposed to occupational noise. Brazilian Journal of Otorhinolaryngology. 2012; 78(6):107-112.
Pyykkö I, Koskimies K, Starck J, Pekkarinen J, Färkkilä M, Inaba R. Risk factors in the genesis of sensorineural hearing loss in Finnish forestry workers. British Journal of Industrial Medicine. 1989; 46:439-446.
Iki M, Kurumatani N, Satoh M, Matsuura F, Arai T, Ogata A, Moriyama T. Hearing of forest workers with vibration-induced white finger: A five year follow-up. International Archives of Occupational and Environ-mental Health. 1989;61(7):437-442.
Turcot A, Girard AS, Courteau M, Baril J, Larocque L. Noise-induced hearing loss and combined noise and vibration exposure. Occupational Medicine. 2015; 65(3):238–244.
Araújo SA. Noise-induced hearing loss in metallurgical workers. Brazilian Journal of Otorhinolaryngology. 2002;68(1):47-52.
Fernandes M, Morata TC. Study of auditory and extra-auditory effects of occupational exposure to noise and vibration. Brazilian Journal of Otorhino-laryngology. 2002;68(5):705-13.
Feyzi M, Jafari A, Ahmad H. The effect of operation and engine speed on chainsaw vibration. Journal of Agricultural Machinery. 2018;8(2):263-277.