Outdoor Air Pollution
PM 2.5 and PM 10
Indoor Air Pollution
- Haze is caused when sunlight
encounters tiny pollution particles
in the air especially PM 2.5.
- More pollutants, more absorption
and scattering of light.
- Natural or manmade air pollutant.
- Natural windblown dust, soot
- Manmade Vehicles, industrial
fuel burning, manufacturing
- Complex mixture of extremely small
particles and liquid droplets.
- Size of particles linked to their potential
for causing health problems.
- PM10 inhalable coarse particles,
2.5~10 micrometers. Eg, near roadways
and dusty industries.
- PM 2.5 fine particles, smaller than
2.5 micrometers. Eg, forest fires, gases
from power plants, industries.
- Premature death in people with heart or
lung disease, aggravated asthma,
increased respiratory symptoms such as
irritation of airways, coughing or
PARTICULATE MATTER (PM)
Indoor air is 2-5 times polluted than
INDOOR AIR POLLUTION
Is outdoor air quality better than indoor air
- Volatile organic compounds are organic chemicals that have high
vapor pressure in room temperature.
- Large number of molecules evaporate to surroundings.
- Harmful VOCs typically not acutely toxic, but have compounding
long-term health effects.
- Major manmade VOCs: Protective coatings, paints, CFCs,
- Newly furnished buildings or furniture.