This study indicated that warehouse workers had more abnormal symptoms than controls. Cold and dry air inspiration caused acute and chronic symptoms of the upper and lower respiratory tract. Higher morbidity and mortality in the winter [31] was indicated by 160,000 deaths in Michigan with chronic obstructive disease who were at higher risk on colder days [32]. Respiratory disease among
employees became worse below 15C [33], however; differences in sensitivity of each and ventilation were associated with the symptoms [34].