TY - JOUR T1 - Nitrogen oxides in ambient air--properties, sources and concentrations. JO - Scandinavian Journal of Work, Environment & Health PY - 1993/VL - 19 IS - 2 SP - 9 EP - 13 AU - Bostrom, C E UR - https://www.sjweh.fi/show_abstract.php?abstract_id=1511 SN - 0355-3140 ER -