Download - Indoor Air Quality Measurement in Hong Kong
Indoor Air Quality
Measurement in Hong Kong
Speaker : Prof. YEUNG Lam Lung The Hong Kong University of Science and Technology
• The seminar builds on knowledge learnt in the DSE curriculum
– Chemistry: Topics IV, XI, XIV and XV – Combined Science (Chemistry): Topic IV
Curriculum Links
• For offices and public places • Voluntary for certification
• Certificate valid for 5 years
• Two Level ‘Excellent’ class or
‘Good’ class
Indoor Air Quality (IAQ) Certification Scheme
• Physical parameters: temperature humidity air movement • Excellent Class : 20-25.5oC • Good Class : < 25.5oC
12 IAQ Parameters
• Formaldehyde • Volatile Organic Compounds (VOCs) • Carbon dioxide • Carbon monoxide • Nitrogen dioxide • Ozone • Radon • Respirable suspended particles (PM10)
Chemical parameters
• A kind of VOCs • Released from pressed wood
products, carpet adhesives or burning cigarettes
• Tested with DNPH (2,4-dinitrophenylhydrazine) obtaining a coloured product
Formaldehyde (HCHO)
HCHO +
• Ozone is produced by photocopiers, laser printers
• Such equipments utilise UV light or high voltage and cause ionisation of oxygen
Ozone (O3)
O2 + h 2O + 2O2 2O3
• Radon is a noble gas. • Isotope (Rn-222) is formed from radium
(Ra-226) which is found in soils and rocks, particularly granite.
• Rn-222 is radioactive. • Rn-222 decays to gives toxic substances.
Radon (Rn)
226Ra222Rn218Po214Bi210Pb
Rn
Rn
Glossary
Indoor air quality 室內空氣質素
2,4-dinitrophenylhydrazine 2,4-二硝基苯肼
volatile organic compounds 揮發性有機物
radon 氡
respirable suspended particles 可吸入懸浮粒子
granite 花崗岩
• The link to EDB Glossary (Chinese/English) is http://www.edb.gov.hk/tc/curriculum-development/kla/science-edu/ref-and-resources/glossary.html
EDB Glossary