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WEDNESDAY, JULY 13, 1994
* LOCATIONS CLOSE TO ROAD TRAFFIC IN BUILT-UP URBAN AREAS;
* COMBINED COMMERCIAL AND RESIDENTIAL DISTRICTS; AND
* DISTRICTS CLOSE TO INDUSTRIAL AREAS.
AT
MEASUREMENT
THE DEPARTMENT CURRENTLY MONITORS AIR QUALITY CONTINUOUSLY EIGHT STATIONS, INCLUDING THE THREE MENTIONED. SHORT-TERM CAMPAIGNS ARE ALSO UNDERTAKEN AS AND WHERE THE NEED ARISES.
THE
SULPHUR DIOXIDE (802), WHICH (TSP) PARTICULATES
SUSPENDED
AIR POLLUTANTS INCLUDE REPORTED NITROGEN DIOXIDE (NO2), TOTAL SUSPENDED COMPRISE ALL SIZES OF
AND PARTICLES,
RESPIRABLE DUST PARTICULATES (RSP) WHICH ARE THE RESPIRABLE FRACTION OF THE DUST.
ALL THESE
POLLUTANTS
CAN
AFFECT RESPIRATORY
HEALTH
IN
SUFFICIENT CONCENTRATION,
DURING THE MONTH, THE AIR POLLUTION LEVELS WERE ALL WITHIN HONG KONG AIR QUALITY OBJECTIVES.
THE
FOR BOTH THE MONG KOK AND CENTRAL/WESTERN STATIONS, QUALITY WAS GOOD AS ALL POLLUTANT CONCENTRATIONS WERE BELOW CENT OF THE OBJECTIVE VALUES.
THE
LOWER
AIR
POLLUTION
LEVELS WERE
PROBABLY COMBINATION OF HEAVY RAINFALL AND STRONG WIND IN THE MONTH.
THE
AIR 50 PRR
DUE
TO
A
VARIOUS ARE
THE GASES AND PARTICLES DESCRIBED ORIGINATE FROM SOURCES. S02 IS MOSTLY PRODUCED WHEN FUELS THAT CONTAIN SULPHUR BURNED. NOŽ IS FORMED DURING COMBUSTION BY THE COMBINATION OF NITROGEN AND OXYGEN.
HOWEVER THE MAJORITY OF IT IS FORMED IN THE ATMOSPHERE BY OXIDATION OF NITRIC OXIDE (NO), ALSO A PRODUCT OF COMBUSTION.
THE
VEHICLE EXHAUSTS ARE IMPORTANT SOURCES OF NO AND NO2 IN OF IMPACT ON LOCAL AIR QUALITY,
TERMS
SOURCES
OF
THESE EXHAUSTS ARE ALSO A MAJOR SOURCE OF AIRBORNE MATTER, ESPECIALLY THE SMALLER RESPIRABLE PARTICLES.
OTHER
PARTICLES INCLUDE
INDUSTRY, BOILERS, CONSTRUCTION ACTIVITIES, THE SEA AND THE SOIL.
PARTICULATE
FURNACES
AND
ALWAYS IT IS WORTH NOTING THAT WHILST THE WEATHER AND CLIMATE
WAY AFFECT THE CONCENTRATIONS OF POLLUTANTS IN THE AIR, THE ONLY SURE
EMISSIONS FROM THE MAN-MADE OF
LEVELS IS TO REDUCE REDUCING THE
SOURCES.
NOTE TO EDITORS:
AIR
FOR FURTHER INFORMATION ON THIS AIR QUALITY REPORT
PRINCIPAL ACTING QUALITY ISSUES, PLEASE CONTACT
PROTECTION OFFICER MR PANG SIK-WING ON TEL 594 6401.
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AND OTHER ENVIRONMENTAL
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