Air Quality Monitoring NetworkManagement in Hong Kong
Peter Louie and Chris Cheung
Environmental Protection Department, Hong Kong SAR Government
Better Air Quality 2002
1. Network Management
2. Air Quality Monitoring Network
3. Data Processing and Dissemination
4. Quality Assurance System
CONTENTSCONTENTS
Ambient air pollution
Occurs occasionally under calm weather condition
“Smog” caused by emissions from both HK and the South China region
Air Pollution Issues
General Picture of HK’s Air Quality
Levels of major pollutants
Low levelLead
Low levelSulphur dioxide
Low levelCarbon monoxide
On a rising trendOzone
High level at roadside[exceeded long-term (1 year) AQO]
Nitrogen dioxide
High level at roadside[exceeded long-term (1 year) AQO]
Respirable suspended particulates
NETWORK MANAGEMENT NETWORK MANAGEMENT
Contractor Operated StationsContractor Operated Stations
EPD EPD
5 x 5 x 9 x 9 x
EPD Operated StationsEPD Operated Stations
Contract ManagementContract Management
QA/QC WorksQA/QC Works QA/QC WorksQA/QC Works
HI-VOL SAMPLERS
WET/DRY DEPOSITION
SAMPLER
PARTICULATE MONITOR
OPEN PATH ANALYZER
METEOROLOGICALMONITORS
POINT ANALYZER
AIR QUALITY MONITORING NETWORK
AIR QUALITY MONITORING NETWORK
Roadside Station General Station
塔門Tap Mun
東涌Tung Chung 東區
Eastern銅鑼灣Causeway Bay
中西區Central / Western
旺角Mong Kok
荃灣Tsuen Wan
觀塘Kwun Tong
大埔Tai Po
元朗Yuen Long
葵涌Kwai Chung
沙田Sha Tin
深水Sham Shui Po
中區Central
■
■
■■General StationWith TAP samplers
Air Monitoring Station (Central & Western)
Ambient Air Quality Monitoring Station(Tsuen Wan)
Air Monitoring Station(Tsuen Wan)
TAPs Monitoring Station(Tsuen Wan)
Roadside Station(Mong Kok)
Roadside Station(Mong Kok)
Roadside Station(Mong Kok)
DATA PROCESSING AND DISSEMINATION
DATA PROCESSING AND DISSEMINATION
AIR QUALITY DATA MANAGEMENT SYSTEM
2000AIR QUALITY IN HONG KONGAIR QUALITY IN HONG KONG
AIR QUALITY REPORT
INTERNET WEBSITEhttp://www.epd-asg.gov.hk
GRAVIMETRICANALYSIS
ELEMENTAL ANALYSIS
DATEL LINE
API REPORTINGSYSTEM
API HOTLINE:2827 8541
GENERAL API
ROADSINEAPI
INTERNET WEBSITE http://www.epd-asg.gov.hk
HI-VOL SAMPLERS
WET/DRY DEPOSITION
SAMPLER
PARTICULATE MONITOR
OPEN PATH ANALYZER
METEOROLOGICALMONITORS
POINT ANALYZER
REMOTE DATA LOGGING SYSTEM
CENTRAL DATA MANAGEMENT SYSTEM Station A
API 84...
空氣污染指數空氣污染指數Air Pollution IndexAir Pollution Index
API
空氣污染指數的目的PURPOSES OF AIR POLLUTION INDEX
提供快捷而簡單的空氣污染資料 Provide timely and simple information on
air pollution1.在空氣污染事件未發生前, 給予市民忠告Advise people before the onset of air pollution incidents
2.
AIR POLLUTION INDEX BANDSAIR POLLUTION INDEX BANDS
SevereSevere
VeryVeryHighHigh
HighHigh
MediumMedium
LowLow
2525
5050
100100
200200
500500
00
More than two times the short-term More than two times the short-term AQOAQO value value
Between 1 to 2 times the short-term Between 1 to 2 times the short-term AQOAQO value value
Between half and 1 time the short-Between half and 1 time the short-term term AQOAQO value value
Between half and 1 time the long-term Between half and 1 time the long-term or 50% of short-term or 50% of short-term AQOAQO value value
Less than 50% of long-term or 25% Less than 50% of long-term or 25% of short-term of short-term AQOAQO value value
* Short-term - 1 hr or 24 hrs averageLong-term - 1 year average
QUALITY ASSURANCE QUALITY ASSURANCE
QUALITY CONTROL QUALITY CONTROL QUALITY ASSESSMENT QUALITY ASSESSMENT
Applies in ……………..
•Site Selection
•Precision of Equipment
•Equipment Calibration
•Equipment Maintenance
Applies in ……………..
•Site Selection
•Precision of Equipment
•Equipment Calibration
•Equipment Maintenance
Includes………………….
•Routine Precision Checks
•Performance Audits
•System Audits
Includes………………….
•Routine Precision Checks
•Performance Audits
•System Audits
Types of Quality Control : QC and QA
• Quality Control – control the quality by field and data processing
staff (responsible for daily operation of sampling network)
• Quality Assurance– control the quality by QA staff (not involved in
daily sampling work)
Quality Control (QC)
• Precision checks
- gases : biweekly one point check
- particulates : collocated sampling for Hi-vol samplers
- Control limits : 20% for gases
10% for particulates
Quality Assurance (QA)
• Accuracy - Performance Audit by QA staff
• Traceability
• System Audit
• Inter-laboratory Comparison
System Audit• Documentation & labeling • Data processing• Vertical audit• Training - check the competence &
annual reassessment records - observe operation at site
• Safety • Site environment
Conclusions• EPD’s Air Quality Monitoring Network is
managed by using a combination of quality assurance system and out-sourcing arrangement
• Better understanding of air pollution issues
• Cost-effective policies and solutions can be developed
END 完 Thank You謝謝