Source
Data
Source
data is collected from four 24-hr realtime monitoring points as
indicated.
Top
Figure is the Carbon Monoxide level at that point. CO is a
general measure of exhaust concentrations in any local area.
Bottom Figure is a measure of hydrocarbons based on phenyl-benzoate
aromatics. These compounds create the photo-chemical smog seen on
sunny days above the city.
Sensors
at Jan 2003:
Oxford Street - Selfridges
Baker St - Junction of Marylebone Road
Gt
Portland St - Tube Station
Portland
Place - BBC Broadcasting House
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