Noah S. Seixas, PhD, MS

Professor, Env. and Occ. Health Sciences (Primary department)
Dr. Seixas is a certified industrial hygienist with an emphasis on the quantification of exposure for occupational epidemiology. In addition to teaching occupational hygiene courses and maintaining an active research program,Dr. Seixas serves as Chief Editor of the Annals of Occupational Hygiene. Current research interests include characterization of exposures and intervention strategies to control exposures to noise in construction and welding fume in shipyards. Dr. Seixas is also interested in organizational factors that may contribute to disparaties in occupational health experience, especially among immigrant workers.

Contact Information

Box: 354695
4225 Roosevelt Way NE
Seattle, WA 98195-
Tel: 206-685-7189

Research Interests

  • Exposure assessments in the context of retrospective, cross-sectional and prospective epidemiology studies and health and safety needs of workers in precarious jobs; Characterization and control of welding fume exposures in shipbuilding and other industries; Investigations in the mining, construction, waste handling, and primary and secondary metal industries; Evaluating the effectiveness of organizational interventions to improve safety and health performance; Developing effective health and safety programs for contingent and immigrant workers
  • KEYWORDS: Construction safety and health, Contingent and immigrant worker safety and health, Endotoxin, Environmental epidemiology, Exposure assessment, Global occupational health, Hard metal/machining, Hearing loss (noise-induced), Health and safety education, Health and safety management, Industrial hygiene, Noise, Occupational disease statistics, Occupational and environmental epidemiology, Occupational exposure, Safety, Silica, Welding & metal trades & hazards, Workplace hazards, Welding & metal trades & hazards


PhD, Industrial Hygiene, University of Michigan, 1990
MS, Industrial Hygiene, Harvard University, 1982


Addressing the health and safety needs of day laborers and other contingent workers.
Training to improve effectiveness of joint labor-management health and safety committees.
Reducing welding fume exposure in shipyard confined spaces.
Welding exposures and risks of neurological disease among shipyard welders.
Evaluating health and safety experience of commercial janitors.
Developing accurate biomarkers for welding fume exposures, especially manganese.
Selected Publications

Peer Reviewed: Published

Neitzel R, Daniell WE, Sheppard L, Davies HW, Seixas NS.  Evaluation and Comparison of Three Exposure Assessment Techniques.  J Occup Environ Hyg 8(5):310-23, 2011 [PMID: 21491323].

Neitzel R, Daniell WE, Sheppard L, Davies HW, Seixas NS.  Improving Exposure Estimates by Combining Exposure Information. Ann Occup Hyg 55(5):537-47, 2011. [PMID: 21467124].

Neitzel R, Stover, B, Seixas, NS.   Longitudinal Assessment of Noise Exposure in a Cohort of Construction Workers.  Ann Occup Hyg 55(8):906-916 (2011) [PMID: 21825303].

Hobson A, Seixas NS, Sterling D, and Racette BA. Estimation of particulate mass and manganese exposure levels among welders. Ann Occup Hyg 55:113-125, 2011. [pmid : 20870928]

Seixas NS, Neitzel R, Stover B, Sheppard L, Daniell WE, Edelson J, Meischke H. A multi-component intervention to promote hearing protector use among construction workers. Internat J Audiology 55 :113-125, 2011. [pmid : 21091403]

Gold LS, Stewart P, Milliken K, Purdue M, Severson R, Seixas NS, Blair A, HartgeP, Davis S, De Roos A. The Relationship between Multiple Myeloma and Occupational Exposure to Six Chlorinated Solvents.  Occup and Environ Med, Sep 10, 2010. [pmid 20833760]

Checkoway H, Ray RM, Lundin JI, Astrakianakis G, Seixas NS, Camp JE, Wernli KJ, Fitzgibbons ED, Li W, Feng Z, Gao DL, ThomasDB.  Lung Cancer and Occupational Exposures Other than Cotton Dust and Endotoxin among Women Textile Workers in Shanghai, China.  Occup Environ Med. (12)2010. [pmid : 21131604]

Gold LS, Milliken K, Stewart P, Purdue M, Severson R, Seixas N, Blair A, Davis S, Hartge P, De Roos AJ. Occupation and multiple myeloma: an occupation and industry analysis.  Am J Ind Med. 53:768-79. 2010.

de Castro AB, Voss JG, Ruppin A, Dominguez CF, Seixas NS. Stressors among Latino day laborers. A pilot study examining allostatic load.  AAOHN J. 58:185-96. 2010.

Lowry SJ, Blecker H, Camp J, De Castro A, Hecker S, Arbabi S, Traven N, Seixas NS. Possibilities and Challenges in Occupational Injury Surveillance of Day Laborers.  Am J Indus Med, 53(2):126-34. 2009.

Hobson A, Sterling D, Emo B, Evanoff B, Sterling C, Good L, Seixas N, Checkoway H, Racette B.  Validity and Reliability of an Occupational Exposure Questionnaire for Parkinsonism in Welders. J Occup Environ Hyg, 6:324-331, 2009.

Edelson J, Neitzel R, Meischke H, Daniell W, Sheppard L, Stover B, Seixas N. Predictors of Hearing Protection Use in Construction Workers. Ann Occup Hyg, 53:605-616, 2009.

Griffin S, Neitzel R, Daniell W, Seixas, N. Indicators of Hearing Protection Use: Self-Report and Researcher Observation. J Occup Environ Hyg 6:639-647, 2009.

Neitzel R, Daniell WE, Meischke H, Sheppard L, Davies H, Seixas NS.  Comparison of perceived and quantitative measures of occupational noise exposure.  Ann Occup Hyg, 53:41-54, 2009.

Turnberg WL, Daniell, W, Simpson T, Van Buren J, Seixas N, Lipkin E, Duchin J. Personal and worksite characteristics related to healthcare workers' reported use of respiratory infection control measures in ambulatory healthcare settings. Infection Control and Hospital Epidemiology, 30:47-52, 2009.

Neitzel R, Seixas N, Harris MJ, Camp J. Exposure to fall hazards and safety climate in the aircraft maintenance industry. Journal of Safety Research 39:391-402, 2008.

Wernli KJ, Ray RM, Gao DL, Fitzgibbons ED, Camp JE, Astrakianakis G, Seixas NS, Li W,  De Roos AJ, Feng Z, Thomas DB, Checkoway H. Occupational Risk Factors for Endometrial Cancer among Textile Workers in Shanghai, China.  Am J Ind Med, 51:673-679, 2008.

Seixas NS, Blecker H, Camp J, Neitzel R. Occupational health and safety experience of day laborers in Seattle, WA. Am J Ind Med 51:399-406. 2008.  

Wernli KJ, Ray RM, Gao DL, Fitzgibbons ED, Camp JE, Astrakianakis G, Seixas N, Wong EY, Li W, DeRoos AJ, Feng Z, Thomas DB, Checkoway H. Ovarian cancer in association with occupational risk factors in textile workers, Shanghai, China.  Epidemiology 19:244-250, 2008.

Turnberg W, Daniell W, Seixas N, Simpson T, Van Buren J, Lipkin E, Duchin J. Appraisal of recommended respiratory infection control practices in primary care and emergency department settings.  Am J Infect Control:36:268-75, 2008.

Mehta AJ, Wang XR, Eisen EA, Dai H, Astrakianakis G, Seixas N, Camp J, Checkoway H, Christiani DC. Work area measurements as predictors of personal exposure to endotoxin and cotton dust in the cotton textile industry.  Annals Occup Hyg 52:45-54, 2008.

Trabeau M, Neitzel R, Meischke H, Daniell W, Seixas N. An evaluation of Train the trainer vs. expert training modalities for hearing protection use in construction.  Am J Indus Med 51:130-137, 2008.

Neitzel R, Meischke H, Daniell W, Traveau M, Somers S, Seixas N. Development and pilot test of hearing conservation training for construction workers.  Am J Indus Med 51:120-129, 2008. 

Naidoo R, Robins T, Becklake M, Thompson ML, Seixas NS. Cross shift peak flow changes and respirable dust exposure among coal minters in three South African mines.  Am J Ind Med, 50:992-8, 2007.

Mills DM, Feeney MP, Drake EJ, Folsom RC, Sheppard L, Seixas NS. Comparing distortion product otoacoustic emission measurements made by different systems. J Acous Soc Amer 122:2203-2214, 2007.

Carlsten C, DeRoos AJ, Kaufman JD, Checkoway H, Wener M, Seixas N. Cell markers, cytokines and immune parameters in cement mason apprentices. Arthritis Rheum.57(1):147-53, 2007.

Astrakianakis G, Seixas N, Ray R, Camp JE, Gao DL, Feng Z, Li W, Wernli KJ, Fitzgibbons ED, Thomas DB, Checkoway H.  J Natl Cancer Inst:99:357–64, 2007.

Ray R, Gao, DL, Li W, Wernli KJ, Astrakianakis G, Seixas NS, Camp JE, Fitzgibbons ED, Feng Z, Thomas DB, Checkoway H. Breast Cancer and Occupational Exposures among a Cohort of Women Textile Workers in Shanghai, China. Epidemiology 18:383-392, 2007.

Goldman B, Sheppard L, Kujawa SG, Seixas N.  Modeling distortion product otoacoustic emission input/output functions using segmented regression. J Acoust Soc Am. 120(5 Pt 1):2764-76, 2006.

Wernli K, Astrakianakis G, Seixas N, Camp J, Ray R, Chang C, Li G, Thomas D, Checkoway H. Development of a Job Exposure Matrix (JEM) for the Textile Industry in Shanghai, China. J Occup Environ Hyg. 3:521-9, 2006.

Neitzel R, Berna B, Seixas N. Noise exposures aboard commercial catcher/processor fishing vessels.  Am J Indus Med 49:624-33, 2006.

Astrakianakis G, Seixas N, Camp J, Smith TJ, Bartlett K, Checkoway H. Cotton dust and endotoxin levels in three Shanghai textile factories: a comparison of samplers.  J Occup Environ Hyg. 3:418-27, 2006.

Astrakianakis G, Seixas N, Camp JE, Christiani DC, Feng Z, Thomas DB, Checkoway H. Modeling, estimation and validation of cotton dust and endotoxin exposure in Chinese textile operations. Annals of Occup Hyg 50: 573-582, 2006.

Li W, Ray RM, Gao DL, Fitzgibbons ED, Seixas N, Camp JE, Wernli KJ, Astrakianakis G, Feng Z, Thomas DB, Checkoway H. Occupational risk factors for pancreatic cancer among female textile workers in Shanghai, China. Occup Environ Med 63:788-93, 2006.

Neitzel R, Somers S, Seixas N. Variability of real world hearing protection measurements.  Annals of Occup Hyg, Ann Occup Hyg.  50:679-91, 2006.

Naidoo RN, Seixas N, Robins TG.  Estimation of respirable dust exposure among South African Coal miners.  J Occup Environ Hyg 3:293-300, 2006.

Naidoo RN, Robins TG, Seixas N, Lalloo UG, Becklake M.  Respirable coal dust exposure and respiratory symptoms in South-African coal miners: a comparison of current and ex-miners. J Occup Environ Med. 48:581-90, 2006.

Wernli KJ, Fitzgibbons ED, Ray RM, Li GD, Li W, Seixas N, Camp JE, Astrakianakis G, Feng Z, Thomas DB, Checkoway H.  Occupational Risk Factors for Esophageal and Stomach Cancers among Female Textile Workers in Shanghai, China.  Am J Epidem 163:717-725, 2006.

Flanagan ME, Seixas N, Becker P, Takacs B, Camp J. Silica exposure on construction sites: Results of silica exposure monitoring data compilation project. J Occup Environ Hyg, 3:144-152, 2006.

Chang CK, Astrakianakis G, Thomas DB, Seixas N, Camp JE, Ray RM, Gao DL, Wernli KJ, Li W, Fitzgibbons ED, Vaughan TL, Checkoway H. Risks of biliary tract cancer and occupational exposures among Shanghai women textile workers: a case-cohort study.  Am J Ind Med 49:690-8, 2006.

Li W, Ray RM, Li GD, Fitzgibbons ED, Seixas NS, Camp JC, Wernli KJ, Astrakianakis G, Feng Z, Thomas DB, Checkoway H. Occupational risk factors for nasopharyngeal and sinonasal cancers among female textile workers in Shanghai, China. Occup Environ Med, 63: 39-44, 2006.

Chang CK,  Astrakianakis G, Thomas D, Seixas NS, Ray RM, Gao DL, Wernli KJ, Fitzgibbons ED, Vaughan TL, Checkoway H. Occupational Exposures and Risks of Liver Cancer among Shanghai Female Textile Workers – A Case-Cohort Study. Intern J Epid 35(2):361-9, 2006.

Naidoo RN, Robins TG, Seixas NS, Lalloo U, Becklake M.  Differential respirable dust related lung function effects in current and former South African coal miners.  International Arch Occup Environ Health 78:293-302, 2005.

Neitzel R, Seixas NS. Effectiveness of hearing protection among construction workers. J Occup Environ Hyg, 2:227-238, 2005.

Jeebay M, Robins T, Seixas N, Baatjies R, George DA, Rusford E, Lehrer SB, Lopata AL. Environmental exposure characterization of fish processing workers. Ann Occup Hyg. 49:423-437, 2005.

Seixas NS, Goldman B, Sheppard L, Neitzel R, Norton S, Kujawa SG.  Prospective noise induced changes to hearing among construction industry apprentices. Occup Environ Med, 62:309-317, 2005.

Seixas NS, Neitzel R, Sheppard L, Goldman, B. Alternative metrics for noise exposure among construction workers. Ann Occup Hyg, 49:493-502. 2005.

Seixas N, Kujawa G, Norton S, Sheppard L, Neitzel R, Slee A. Predictors of hearing threshold levels and distortion product otoacoustic emissions among noise exposure young adults.  Occup Environ Med, 61:899-907, 2004.

Carter S, Seixas N, Morgan M. Peak Exposures in Aluminium Potrooms: Instrument Development and Field Calibration. J Environ Monitoring, 6:932-937, 2004.

Croteau G, Flanagan ME, Camp J, Seixas N. Efficacy of local exhaust ventilation for controlling dust exposures during concrete surface grinding.  Ann of Occup Hyg, 48:509-518, 2004.

Neitzel, R., Seixas, N., Goldman, B., Daniell, W.  Contributions of non-occupational activities to total noise exposure of construction workers.  Ann Occup Hyg, 48: 463-473; 2004.

Neitzel, R., Seixas, N., Olson, J., Daniell, W., Goldman, B.  Non-occupational noise: Exposures associated with routine activities. J Acoust Soc Am, 115:237-245, 2004.

Reeb-Whitaker CK, Seixas NS, Sheppard L, Neitzel R. Accuracy of task recall for epidemiological exposure assessment to construction noise.  Occup and Environ Med. 61:135-142, 2004.

Seixas NS, Sheppard L, Neitzel R. Comparison of task-based and full-shift strategies for noise exposure assessment.  Am Ind Hyg Assoc J, 64:823-829, 2003.

Camp JE, Seixas N, Fitzgibbons D, Astrakianakis G, Thomas DB, Gao DL, Checkoway H. Research in the Shanghai Textile Industry.  Int J Occup Environ Health 9:347-356, 2003.

Flanagan ME, Seixas NS, Majar M, Camp J, Morgan M.  Silica dust exposures during selected construction activities. Am Ind Hyg Assoc J. 64:319-328, 2003.

Daniell WE, Swan SS, McDaniel MM, Stebbins JH, Seixas NS, Morgan MS. Noise exposure and hearing conservation practices in an industry with high incidence of workers’ compensation claims for hearing loss. Am J Indus Med 42:309-317, 2002.

Yingratanasuk T,  Barnhart S, Seixas N.  Respiratory health and silica exposure of stone carvers in Thailand.  Inter J Occup and Environ Health 8:301-308, 2002.

Croteau GA, Guffey SE, Flanagan ME and Seixas NS. The effect of local exhaust ventilation controls on dust exposures during masonry activities. Am Indus Hyg Assoc J 63:458-467, 2002.

Li H, Wang ML, Seixas N, Ducatman A, Petsonk EL.  Respiratory protection: Associated factors and effectiveness of respirator use among underground coal miners.  Am J Indus Med 42:55-62, 2002.

Durand KTH, Muilenberg ML, Burge HA, Seixas N. Effect of sampling time on the culturability of airborne fungi and bacteria sampled by filtration.  Annals of Occupational Hygiene, 46:113-118, 2002. 

Neitzel R, Seixas N, Ren K.  Review of crane safety in the construction industry. Appl Occup Environ Hyg 16:1106-1117, 2001.

Engel L, Seixas N, Keifer M, Longstreth W, Checkoway H. Validity study of self-reported pesticide exposure among orchardists.  Inter J Expo Assess Environ Epidem. 11 :359-368, 2001.

Seixas N, Ren K, Neitzel R, Camp J, Yost M. Noise exposure among construction electricians. Am Indus Hyg Assoc J  62:615-621, 2001.

Engel LS, Checkoway H, Keifer MC, Seixas NS, Longstreth WT, Scott KC, Hudnell K, Anger WK, Camicioli R. Parkinsonism and occupational exposure to pesticides. Occup and Environ Med, 2001.

Abrams L, Seixas N, Robins T, Burge H, Muilenberg M, Franzblau A. Characterization of Machining Fluid Exposure Indices for a Study of Acute Respiratory Effects.  Applied Occupational and Environmental Hygiene, 15:492-502, 2000.

Seixas N, Cohen M, Zevenbergen B, Coty M, Carter S, Kaufman J. Urinary fluoride as an exposure index in aluminum smelting. Am Indus Hyg Assoc J., 61:89-94, 2000.

Neitzel R, Seixas N, Camp J, Yost M. An assessment of occupational noise exposures in four construction trades. Am Indus Hyg Assoc J 60:807-817, 1999.

Checkoway H, Hughes JM, Weill H, Seixas N, Demers PA. Crystalline silica exposure, radiological silicosis, and lung cancer mortality in diatomaceous earth industry workers.  Thorax 54:56-59, 1999.

Hughes JM, Weill H, Checkoway H, Jones RN, Henry M, Heyer NJ, Seixas N, Demers PA. Radiographic evidence of silicosis risk in the diatomaceous earth industry.  Am J Respir Crit Care Med 158:807-814, 1998.

Seixas N, Sanders J*, Sheppard L, Yost MG. Exposure assessment for acute injuries on construction sites: Conceptual development and pilot test. Applied Occup Environ Hyg. 13:304-312, 1998.

Seixas, N, Heyer N, Welp E, Checkoway H. Quantitation of historical exposures in the diatomaceous earth industry. Ann Occup Hyg, 41:591-604, 1997.

Checkoway H, Heyer NJ, Seixas N, Welp EAE, Demers PA, Hughes JM, Weill H. Dose-response associations of silica with non-malignant respiratory disease and lung cancer mortality in the diatomaceous earth industry. Am J Epid 145:680-688, 1997.

Robins TG, Seixas N, Franzblau A, Abrams L, Minick S, Burge H, Schork A.  Acute respiratory effects on workers exposed to metalworking aerosols in an automotive transmission plant. Am J Indus Med 31:510-534, 1997.

Seixas N, Sheppard L. Maximizing accuracy and precision using individual and grouped exposure assessments. Scand J Work Environ Health, 22:94-101, 1996.

Checkoway H, Seixas N, Demers PA. The influence of occupational exposure assessment on epidemiologic inferences. Occup Hyg. 3:7-21, 1996.

Seixas N, Checkoway H. Exposure assessment in industry-specific retrospective occupational epidemiology studies.  Occup Environ Med, 52:625-633, 1995.

Seixas, N, Hewett P, Robins TG, Haney R. Variability of particle size-specific fractions of personal coal mine dust exposures. Am Ind Hyg Assoc J, 56:243-250, 1995.

Attfield MD, Seixas N. Prevalence of Pneumoconiosis and its relationship to dust exposure in a cohort of US Bituminous Coal Miners and Ex-miners. Am J Indus Med, 27:137-151, 1995.

Seixas N, Robins TG, Attfield MD, Moulton LH. Longitudinal and Cross-sectional studies of respirable coal dust exposure and pulmonary function. Br J Ind Med 50:929-937, 1993.

Seixas N. Quantitative exposure assessment and public health.  New Solutions 4:34-42, 1993.

Rocskay A, Robins TG, Echevarria D, Schork A, Seixas N, White R.  Estimation of cumulative exposure among naphtha exposed automotive workers.  Am Ind Hyg Assoc J 54:480-487, 1993.

Seixas N, Robins TG, Attfield MD, Moulton LH.  Exposure response relationships for coal mine dust and obstructive lung disease following enactment of the Federal Coal Mine Health and Safety Act of 1969. Am J Ind Med 21:715-734, 1992.

Seixas N, Robins TG, Becker MP. A novel approach to the characterization of cumulative exposure for the study of chronic occupational disease. Am J Epidem, 137:463-471, 1991

Seixas N, Moulton LH, Robins TG, Attfield MD, Rice CH, Zellers T.  Estimation of cumulative exposures for the National Study of Coal Workers' Pneumoconiosis. App Occ Envir Hyg 6:1032-1041, 1991.

Seixas N, Robins, TG, Rice CH, Moulton LH. Assessment of potential biases in the application of MSHA respirable coal mine dust data to an epidemiologic study.  Am Ind Hyg Assoc J 51:534-540, 1990. 

Seixas N, Robins TG, Moulton LH. The Use of Geometric and Arithmetic Mean Exposures in Occupational Epidemiology. Am J Ind Med 14:465-477, 1988.

Rosenman KD, Seixas N. Potential Nephrotoxic Effects of Exposure to Silver. Br J Ind Med 44:267-272 1987.


Grant EJ, Ozasa K, Preston DL, Suyama A, Shimizu Y, Sakata R, Sugiyama H, Pham TM, Cologne JB, Yamada M, De Roos A, Kopecky KJ, Porter MP, Seixas N, Davis S.  Effects of radiation and lifestyle factors on risks of urothelial carcinoma in the Life Span Study of atomic bomb survivors. Radiation Research, 2/12.


Seixas NS, Neitzel RL, Stover B, Sheppard L, Feeney P, Mills D, Kujawa SG. 10-year prospective study of noise exposure and hearing damage among construction workers.  Occup Env Med, 11/11.

De Souza R, Hecker S, de Castro A, Stern H, Hernandez A, Seixas NS. Novel approaches to development, delivery and evaluation of a peer-led occupational safety training for Latino day laborers. New Solutions, 1/12.

Other Scholarly Publications

Carter S, Seixas NS. Fluorine and related compounds. in Rosenstock L, Cullen M, Redlich C and Brodkin C, eds. Textbook of Clinical Occupational and Environmental Medicine, 2nd ed. 2005.  

Kaufman JD, Daroowalla FM, Nelson NA, Sama SR, Seixas NS, Cohen MA. A prospective study of respiratory health in aluminum smelter workers.  In Priest ND, O’Donnell TV, eds. Health in the aluminium industry. International Primary Aluminium Institute, Middlesex University Press, London. 1998.

Ph.D. Dissertation: Seixas, NS. "Dust Exposure and Respiratory disease in US Coal Miners",  University of Michigan, Department of Environmental and Industrial Health, October, 1990.

Kaufman JD, Daroowalla FM, Nelson NA, Sama SR, Seixas NS, Cohen MA.  A prospective study of respiratory health in aluminum smelter work.  in Proceedings of the International Conference on Managing Health Issues in the Aluminum Industry, Oct 26-29, 1997. Montreal Canada. International Primary Aluminium Institute. 1998.

Seixas, NS. Environmental Monitoring. in Harber P, Schenker M, Balmes J (eds), Occupational and Environmental Respiratory Diseases. St. Louis, Mosby. 1995.

Seixas NS, Robins T, Attfield M, Moulton L, Rice C, Weeks J. Exposure Estimates for the National Coal Study: The Use of MSHA Compliance Data for Epidemiologic Research. Proceedings of the VIIth International Conference on the Pneumoconioses. Pittsburgh, PA. pp 127-131, 1988.

Seixas NS, Siwinski G, Ghosh A. Bias Introduced by NIOSH Method 7400 Quantitative Fiber Exposure Assessment. Am J Ind Hyg 48:A242-A243, 1987.

Seixas NS, Rosenman KD. Voluntary Reporting System for Occupational Disease, Pilot Project, Evaluation. Public Health Reports, 101:278-282, 1986. 

Materna B, Roseman J, Seixas NS. Small Opportunities, Deep Pitfalls: Occupational Health in Local Health Departments. Health PAC Bulletin 16:15-19, 1985.

Silver K, Seixas NS. "Occupational Health,"  In The Toxics Crisis: What the States Should Do, Conference on Alternative State and Local Policies, Washington, DC, 1983.

Review date: