RT Report
T1 Environmental Health Criteria 188 - Nitrogen Oxides (Second Edition)
A1 World Health Organization, 
K1 nitrogen oxide
K1 chemical
SN 92 4 157188 8
YR 1997
FD 1997
LK https://wedocs.unep.org/handle/20.500.11822/29545
UL https://wedocs.unep.org/handle/20.500.11822/29545
NO Nitrogen oxides can be present at significant concentrations in ambient air and in indoor air. The types and concentrations of nitrogenous compounds present can vary greatly from location to location, with time of day, and with season. The main sources of nitrogen oxide emissions are combustion processes.
DS UN Environment Document Repository
RD Sep 17, 2026