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WHAT IS
PM2.5?
SOURCES
HEALTH
RISKS
PM2.5 refers to particulate matter in the air with a diameter
of 2.5 micrometers or less. Due to its size, PM2.5 is considered
the most hazardous pollutant to human health as it can
be absorbed into the bloodstream via the lungs.
Outdoor: vehicles, wood burning, industrial activities
and other forms of combustion.
Indoor: leaky windows and doors, stove top cooking,
replaces, incense, cleaning products and fragrances.
Short term: eye and nose irritation, irregular
heartbeats, chest pain and sorethroat.
Long term: asthma, emphysema,
lung
damage, cancer, strokes, heart attacks
and premature death.
PM2.5 introduction
Temperature & humidity
Temperature and humidity are often overlooked. Cold, dry environments, however,
may cause respiratory irritations and eczema exacerbation, while overly humid
environments can produce dust mites and mold.
The diagram below is a rough guide for explaining the relationship between tempera-
ture and humidity, and the long-term related effects.
Lung irritation;
Eczema
exacerbation;
Ease of virus
transmission
Ideal level for
comfort & health
Dust mites
Mold
35
30
25
20
15
10
20 30 40 50 60 70 80 90 100
Temperature °C
Relative Humidity %
3


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