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