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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. von Nieding, G., H.M. Wagner, H. Krekeler, H. Loellgen, W. Fries, and A. Beuthan. 1979. Controlled studies of human exposure to single and combined action of NO2, O3, and SO2. Int. Arch. Occup. Environ. Health 43(3):195-210 (as cited in EPA 1993). von Nieding, G., and H.M. Wagner. 1979. Effects of NO2 on chronic bronchitis. Environ. Health Perspect. 29:137-142. von Nieding, G., H.M. Wagner, H. Casper, A. Beuthan, and U. Smidt. 1980. Effect of experimental and occupational exposure to NO2 in sensitive and normal subjects. Pp. 315-331 in Nitrogen Oxides and Their Effects on Health, S.D. Lee, ed. Ann Arbor, MI: Ann Arbor Science Publishers, Inc. (as cited in EPA 1993). Wagner, W.D., B.R. Duncan, P.G. Wright, and H.E. Stokinger. 1965. Experimental study of threshold limit of NO2. Arch. Environ. Health 10(3):455-466 (as cited in EPA 1993). Wong, T.W., W.S. Tam, T.S. Yu, and A.H.S. Wong. 2002. Associations between daily mortalities from respiratory and cardiovascular diseases and air pollution in Hong Kong, China. Occup. Environ. Med. 59(1):30-35. Yokoyama, E., I. Ichikawa, and K. Kawai. 1980. Does nitrogen dioxide modify the respiratory effects of ozone? Pp. 217-229 in Nitrogen Oxides and Their Effects on Health, S.D. Lee, ed. Ann Arbor, MI: Ann Arbor Science Publishers, Inc. (as cited in EPA 1993). Yuen, T.G.H., and R.P. Sherwin. 1971. Hyperplasia of type 2 pneumocytes and nitrogen dioxide (10 ppm) exposure: A quantitation based on electron photomicrographs. Arch. Environ. Health 22(1):178-188 (as cited in EPA 1993).
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