L1 /
10
CH3041
NOx and O3
• The [NOx] in inner cities can be 2ppm whereas the natural level is 3 x 10-3 ppm.
Brisbane exceeds 0.1ppm several times per year,
it is often associated with bushfires.
• The NOx perturbation is only local
as the
anthropogenic emissions are only 8% of the
total NOx emissions.
anthropogenic emissions are only 8% of the
total NOx emissions.
•The
atmosphere characteristic of a
photochemical smog is oxidising in nature.
photochemical smog is oxidising in nature.
• O3 makes up 85% of the oxidant capacity.
• Visibility
is reduced < 1.6 km.
Remote sensing monitors
vehicle emissions Dirtiest 10% of cars emit 50% of VOC & NOx
