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AirTEXT
London's
air pollution alert service.
http://www.airtext.info/
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Asthma
UK
Tells you
everything you want to know about the condition, including
tips on using an inhaler.
http://www.asthma.org.uk/
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Breathin'
Easy
A guide
for travellers with breathing difficulties, which lists worldwide
locations where you can refill your oxygen tank. 
http://www.oxygen4travel.com/
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Celestia.co.uk
A table
showing the altitude of major cities around the globe. 
http://www.celestia.co.uk/wexas/p5_cityaltitudes.htm
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City
Mayors
A guide
to America's most polluted cities.
http://www.citymayors.com/environment/polluted_uscities.html
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Clean
Air Initiative
Dedicated
to helping cities around the world reduce their air pollution
levels.
http://www.cleanairnet.org/
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Density
Altitude Calculator
Just as
it says.
http://wahiduddin.net/calc/calc_da.htm
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Everest
This PBS
website contains an informative section on how altitude affects
the human body and how to cope with those effects.

http://www.pbs.org/wgbh/nova/everest/
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High
Altitude Medicine Guide
All about
altitude sickness and how to avoid it.
http://www.high-altitude-medicine.com/
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Highway
to Health
A discussion
of how air pollution can affect your eyes.
http://www.highwaytohealth.com/travel_center/general/ne_el_16.cfm
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IMAC
Official
air pollution guide to Mexico City.
http://www.sma.df.gob.mx/simat/
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Infoplease.com
An in-depth
look at what causes air pollution and its affects.
http://www.infoplease.com/ce6/sci/A0802906.html
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IPPA
The High
Altitude Pathology Institute of La Paz, Bolivia, dispenses
advice on high altitude travel.
http://www.geocities.com/zubietaippa/
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Outdoor
Action Guide to High Altitude
What is
high altitude? What causes altitude illness? Acclimatization.
Prevention of altitude sickness. Preventative medication.
Acute Mountain Sickness. High Altitude Pulmonary Edema. High
Altitude Cerebral Edema. Ganow Bag. Cheyne-Stokes Respirations.
http://www.princeton.edu/~oa/safety/altitude.html
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Real
Post Reports
This site
offers a totally non-scientific, though still useful, assessment
of pollution levels in major cities around the globe.

http://www.talesmag.com/rprweb/home.shtml
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The
World Bank Group
Tables
from the World Bank, in PDF and Excel formats, detailing air
and water pollution in major cities around the globe. The
statistics date from the 1990's, so the problem is likely
to be even worse now.
http://www.worldbank.org/nipr/wdi98/
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Travel
and Trek
Free guide
to trekking at altitude. In PDF format. 
http://www.travelandtrek.com/Travelandtrek%20-20AMS%20Guide%20v1%20100907.pdf
http://www.travelandtrek.com/
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Travelocity.com
Whether
you are heading for La Paz, Denver or even the Himalayas,
this lengthy discussion of how to avoid altitude sickness
should prove useful.
http://leisure.travelocity.com/Tips/Item/0,,216_TRAVELOCITY,00.html
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USA
Today.com
Information
on Barotitis Media/Aerotitis, an inflammation of the ear caused
by changes in atmospheric pressure.
http://www.healthscout.com/ency/68/438/main.html
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USYD.edu.au
A detailed
medical guide to altitude sickness and atmospheric pressure
that includes information about medication.
http://www-personal.usyd.edu.au/~gerhard/pressure.html
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World
Bank
A free-to-download
spreadsheet detailing air pollution data by country.
http://siteresources.worldbank.org/INTRES/Resources/AirPollutionConcentrationData2.xls
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