View
3
Download
0
Category
Preview:
Citation preview
INDOOR AIR QUALITY
(IAQ)
For Bedok Safety Group (26th May 2011)
By Eric Ng
Absolute Instrument Systems (Pte.) Ltd.
www.aisys.com.sg
Presentation Topics
Why should you be concerned about Indoor Air
Quality?
How to do an IAQ audit?
What parameters are monitored?
Why should you be concerned about
IAQ?
Why should you be concerned about
IAQ? – Sample Questionnaire
Do you have to put on extra clothing for comfort? Regularly / Sometimes / Never
Does the office air feel stuffy?
Does the office air have an unpleasant odour?
Visible mould.
Dusty air vent.
Stuffy nose: daily/2-3 times weekly/Less
Dry throat: daily/2-3 times weekly/Less
Cough: daily/2-3 times weekly/Less
Skin rash/itchiness: daily/2-3 times weekly/Less
Eye irritation: daily/2-3 times weekly/Less
When do you experience relief from these complaints?
After I leave my workstation / After I leave the building / Never – SS 554:2009 Code of practice for Indoor air quality for air-conditioned buildings.
Why should you be concerned about
IAQ?
Ensure comfortable, healthy work environment
Sick Building Syndrome
Building-Related Illness
Productivity concerns
Liability concerns
Singapore Standard SS 554:2009 Code of practice for Indoor air quality for air-conditioned buildings – recommends an IAQ audit be carried out once every three years.
What is Acceptable IAQ
“Air in an occupied space toward which a
substantial majority (80%) of occupants express no
dissatisfaction and in which there are not likely to
be known contaminants at concentrations leading to
exposures that pose a significant health risk.”
– SS 554:2009 Code of practice for Indoor air quality for air-conditioned buildings.
IAQ, Work Performance and Health
Sick Building Syndrome (SBS)
Eye, Nose, Throat Irritations, Coughing, Wheezing, Stuffy or runny nose, Respiratory Infections, Skin Rash, Headaches, Dizziness, Nausea, Fatigue, Difficulty in concentrating.
Conditions required for SBS
Workers experiences these symptoms
And no specific illness can be identified
And symptoms vanish or dissipate shortly after worker leave building.
Causes of poor IAQ
Air-Conditioning and Mechanical Ventilation
(ACMV) systems that are poorly designed,
maintained or operated.
Presence of Sources of indoor air contaminants.
Indoor air contaminants Common sources
Carbon Dioxide Exhaled air, Complete combustion
Carbon Monoxide Vehicles, Cooking, Smoking
Formaldehyde/ TVOC Wooden furniture, cleaning agent, adhesive,
glues, sealants, paints, lacquers, upholstery,
perfumes, disinfectants, paper products.
Ozone Photocopiers, laser printer, ozone generator
Mould Wet or moist carpets, high humidity environment
Bacteria Building occupants, decomposed food, pest
IAQ Audit – a four step protocol
Step 1 – Walk-through inspection
Step 2 – Conduct air sampling and obtain
feedback from building occupants
Step 3 – Data analysis
Step 4 – Building remedial action.
Recommended IAQ parameters
Chemical parameters
Carbon Dioxide – 700ppm above outdoor
Carbon monoxide – 9 ppm
Formaldehyde – 0.1 ppm
TVOC – 3 ppm
Respirable suspended particles – 50 microgram/m3
Thermal comfort parameters
Operative temperature – 24 to 26 ˚C
Relative humidity - <65% for new buildings, <70% for
existing buildings.
Air movement – 0.10 to 0.30 m/s
Recommended IAQ parameters
Recommended IAQ parameters
Biological parameters
Total viable bacterial count – 500 cfu/m3
Total viable mould count – 500 cfu/m3
– SS 554:2009 Code of practice for Indoor air quality for air-conditioned buildings.
IAQ monitor: EVM7
Available Sensors
Relative Humidity
Temperature
CO2 (NDIR)
02
CO
H2S
NO
NO2
HCN
EtO
CL2
SO2
Particulates
Photoionization Detector ppm
Photoionization Detector ppb
IAQ monitor: EVM7
Thank you
Recommended