RT Report
T1 Oxides of Nitrogen: Environmental Health Criteria 4
A1 United Nations Environment Programme, 
A1 World Health Organization, 
K1 environmental health
K1 chemical
K1 toxic substance
K1 nitrogen oxide
K1 nitrogen fixation
K1 environmentally hazardous substance
K1 carcinogen
K1 respiratory disease
SN 92 4 154063 X
YR 1977
FD 1977
LK https://wedocs.unep.org/handle/20.500.11822/29262
UL https://wedocs.unep.org/handle/20.500.11822/29262
NO In the context of this criteria document, the term oxides of nitrogen is understood to include nitric oxide (NO) and nitrogen dioxide (NO2). Other oxides of nitrogen which exist in the atmosphere are not known to have any biological significance and have not been referred to in this document.
DS UN Environment Document Repository
RD Sep 17, 2026