1.4 NO2
NO2 is a trace atmospheric gas and strong oxidant that
is both a threat to human health and implicated in climate
change.1,3 Annual AQG and interim target levels were
set based on the pollutant-attributed increase in all-cause
non-accidental mortality, with moderate certainty evidence, and
cause-specific respiratory mortality, with moderate to high certainty
evidence. In addition, 24-hour levels were based on all cause
non-accidental mortality and asthma-related hospital admissions and
emergency room visits, with high certainty evidence.
- AQG level (µg/m3):
- Annual exposure: 10
- 24-hour exposure: 25
- Interim Targets (µg/m3):
- Annual exposure: 40, 30, 20
- 24-hour exposure: 120, 50
- Health outcomes : all-cause mortality, respiratory mortality,
asthma-related hospital admissions and emergency room visits
- Causality :
- Annual exposure : suggestive of causality for total mortality,
likely causal for respiratory effects
- 24-hour exposure : suggestive of causality for total
mortality, causal for respiratory effects