HKO READINGS & RADIATION LEVEL

YESTERDAY'S WEATHER AND RADIATION LEVEL:
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HONG KONG OBSERVATORY
MAXIMUM AIR TEMPERATURE                       17.0 C
MINIMUM AIR TEMPERATURE                       12.4 C
GRASS MINIMUM TEMPERATURE                      8.9 C
RELATIVE HUMIDITY                          39 - 75 PERCENT
RAINFALL                                         0 MM
TOTAL RAINFALL SINCE 1ST JANUARY            2572.1 MM
AGAINST AN AVERAGE OF                       2386.5 MM
 
OTHER STATIONS                MIN                  MAX
KING'S PARK                  12.5 C               17.9 C
WONG CHUK HANG               11.6 C               18.2 C
TA KWU LING                  4.8 C               20.3 C
LAU FAU SHAN                 9.4 C               21.1 C
TAI PO                       8.8 C               17.7 C
SHA TIN                      12.2 C               18.4 C
TUEN MUN                     11.9 C               20.6 C
TSEUNG KWAN O                11.4 C               18.8 C
SAI KUNG                     11.6 C               16.3 C
CHEUNG CHAU                  11.0 C               19.0 C
CHEK LAP KOK                 12.9 C               20.2 C
TSING YI                     10.4 C               19.2 C
SHEK KONG                    7.5 C               20.1 C
TSUEN WAN HO KOON            9.6 C               19.9 C
TSUEN WAN SHING MUN VALLEY   7.9 C               20.2 C
HONG KONG PARK               11.9 C               18.5 C
SHAU KEI WAN                 11.7 C               17.3 C
KOWLOON CITY                 12.0 C               19.0 C
HAPPY VALLEY                 NO DATA             NO DATA
WONG TAI SIN                 11.8 C               18.4 C
STANLEY                      13.0 C               16.6 C
KWUN TONG                    12.0 C               18.0 C
SHAM SHUI PO                 12.3 C               19.8 C
KAI TAK RUNWAY PARK          12.3 C               17.0 C
YUEN LONG PARK               10.5 C               21.0 C
TAI MEI TUK                  10.9 C               19.0 C
 
DURATION OF SUNSHINE (KING'S PARK):              9.4 H
 
THE MEAN UV INDEX RECORDED AT KING'S PARK YESTERDAY WAS 2,
THE UV INTENSITY WAS LOW.
THE MAXIMUM UV INDEX FOR YESTERDAY WAS 5.
SEA SURFACE TEMPERATURE (WAGLAN ISLAND):        17.9 C
 
YESTERDAY'S (21 DEC 2017) AVERAGE AMBIENT GAMMA RADIATION
DOSE RATE TAKEN OUTDOORS IN HONG KONG RANGED FROM 0.08 TO
0.15 MICROSIEVERT PER HOUR.  THESE ARE WITHIN THE NORMAL
RANGE OF FLUCTUATION OF THE BACKGROUND RADIATION LEVEL IN
HONG KONG (SEE NOTE). THE AVERAGE DOSE RATES MEASURED AT
THE RADIATION MONITORING STATIONS OVER VARIOUS PARTS OF THE
TERRITORY WERE AS FOLLOWS :
 
STATION                     YESTERDAY'S AVERAGE
                            (MICROSIEVERT/HOUR)
PING CHAU                           0.08
TAP MUN                             0.09
KAT O                               0.10
YUEN NG FAN                         0.12
TAI MEI TUK                         0.12
SHA TAU KOK                         0.10
KWUN TONG                           0.12
SAI WAN HO                          0.09
KING'S PARK                         0.15
TSIM BEI TSUI                       0.13
CAPE D'AGUILAR                      0.13
CHEK LAP KOK                        0.15

 
NOTE
1.     FROM READINGS TAKEN AT VARIOUS LOCATIONS IN HONG KONG DURING
       THE PERIOD 1987-2016, THE BACKGROUND AMBIENT GAMMA RADIATION
       LEVELS MAY VARY BETWEEN 0.06 AND 0.30 MICROSIEVERT PER HOUR.
 
2.     THE EXTENT OF HEALTH EFFECTS TO A PERSON AS A RESULT OF
       EXPOSURE TO RADIATION IS EXPRESSED BY A PHYSICAL QUANTITY
       CALLED EQUIVALENT DOSE, IN UNIT OF SIEVERT.  PROTECTIVE
       ACTION MAY BE REQUIRED IF THERE IS AN INCREASE IN THE
       AMBIENT GAMMA DOSE RATE ABOVE BACKGROUND SUCH THAT THE TOTAL
       ADDITIONAL DOSE IS EXPECTED TO EXCEED 5000 MICROSIEVERTS IN
       A RELATIVELY SHORT PERIOD OF TIME. FOR EXAMPLE, A DOSE OF
       5000 MICROSIEVERTS MAY BE REACHED WHEN THE AMBIENT GAMMA
       DOSE RATE IS 1000 MICROSIEVERTS PER HOUR (SEVERAL THOUSAND
       TIMES ABOVE BACKGROUND) AND LASTS FOR 5 HOURS.
 
3.     THE READINGS OF AMBIENT GAMMA RADIATION LEVEL FROM
       INSTRUMENT ARE EXPRESSED IN UNIT OF GRAY, WHICH IS
       NUMERICALLY EQUAL TO THE GAMMA DOSE EXPRESSED IN SIEVERT.

DISPATCHED BY HONG KONG OBSERVATORY AT 00:17 HKT ON 22.12.2017