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Air quality while cycling in Edinburgh
1. A cyclist’s perspective
John Cherrie and Karen Galea
John.Cherrie@iom-world.org
With help from Melanie Gorman Ng and
Araceli Sanchez Jimenez
SEPA LAQM 26 March 2013
INSTITUTE OF OCCUPATIONAL MEDICINE . Edinburgh . UK www.iom-world.org
2. Pollutants are not uniformly
distributed…
• We see variation in
space and time at
fixed point
monitoring stations
• People move
through space and
so each person
experiences
different exposures www.scottishairquality.co.uk
SEPA LAQM 26/03/2013 2
4. Cyclists have higher
exposures…
• One might expect that cyclists
are likely to have higher
exposures than non-cyclists
• But is that the case?
SEPA LAQM 26/03/2013 4
5. Data from China…
Wu D-L. Influences of Commuting Mode, Air Conditioning Mode and Meteorological Parameters on Fine
Particle (PM2.5) Exposure Levels in Traffic Microenvironments. Aerosol Air Qual Res Published Online
First: 2013. doi:10.4209/aaqr.2012.08.0212
SEPA LAQM 26/03/2013 5
6. In cab is now less
polluted?
SEPA LAQM 26/03/2013 6
7. Children may have higher
exposure…
• Child cyclists may have higher exposure
than adults
• Children are smaller and height above the
emission sources, i.e. the tailpipe may be
important
• Buzzard et al showed that
exposure of adults about
half that of a child
Buzzard NA, Clark NN, Guffey SE. Investigation into
pedestrian exposure to near-vehicle exhaust
emissions. Environmental Health 2009;8:13.
SEPA LAQM 26/03/2013 7
8. Sensors…
• We have had a range of direct reading
monitors for some time
• The difference now is that relatively
sensitive low cost devices are becoming
available with data-logging capabilities
• Coupled with information
about position, activity,
environment etc. they can
make a clearer picture of
exposures
SEPA LAQM 26/03/2013 8
13. Some key observations
• Concentration response lagged in relation to
sources
• Response also smoothed to some extent
• The move from the quiet campus
to the roads associated with
a rise in concentration
• Peaks when traffic heavy
• Level seems to rise during
the test
SEPA LAQM 26/03/2013 13
16. Conclusions and
discussion…
• Low-cost sensors offer new possibilities to
investigate exposure to air pollutants
• Video can provide context but is difficult
to interpret in a large-scale study
• Multiple sensors offer great
opportunities, but the
challenge is in working
with enormous datasets
• Watch the video at:
www.youtube.com/watch?v=PafT2SN6GmM
SEPA LAQM 26/03/2013 16