Area Gravidtrap Indices and Density Indices for Aedes albopictus for the 64 survey areas in 2024 are provided below:

Hong Kong Island (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Central/Western Central and Admiralty AGI 4.0 3.0

2.0

 3.8 14.4 9.4 2.9 0.0 4.0 1.9 0.0 0.0
ADI 1.0 1.0 1.0 1.5 1.4 1.3 1.7 N/A 1.0 1.0 N/A N/A
Sheung Wan and Sai Ying Pun AGI 0.0 0.0 0.0 3.6 6.4 12.7 5.4 5.4 0.9 4.5 0.9
ADI N/A N/A N/A 1.0 1.1 1.4 1.2 1.0 1.0 1.0 1.0
Sai Wan AGI 0.0 0.0 0.0 2.8 10.2 10.2 4.6 2.7 2.8 1.9 0.9
ADI N/A N/A N/A 1.0 2.3 1.5 1.4 1.3 1.0 1.0 1.0
Eastern Chai Wan West AGI 0.9 0.0 0.9 6.2 15.9 19.3 4.5 1.8 3.5 0.9 0.0 0.0
ADI 1.0 N/A 1.0 1.1 1.0 1.1 1.0 1.0 1.0 1.0 N/A N/A

Shau Kei Wan and Sai Wan Ho

 AGI 0.0 0.0 0.0 0.9 8.1 15.0 2.9 6.0 0.9 2.8 0.9 0.9
ADI N/A N/A N/A 1.0 1.0 1.5 1.0 1.0 1.0 1.0 1.0 1.0
North Point AGI 0.0 0.0 0.0 4.5 15.2 13.3 5.5 1.9 0.9 3.6 0.9
ADI N/A N/A N/A 1.4 1.1 1.2 1.0 1.0 1.0 1.0 1.0
Southern Aberdeen and Ap Lei Chau AGI 0.0 0.0 0.0 2.8 7.5 13.1 8.5 5.5 1.9 1.8 0.0
ADI N/A N/A N/A 1.0 1.0 1.1 1.2 1.0 1.0 1.0 N/A
Pokfulam AGI 0.0 0.0 0.9 4.3 13.7 8.5 2.6 0.9 0.0 1.7 0.0
ADI N/A N/A 1.0 1.2 1.1 1.5 1.0 1.0 N/A 1.0 N/A
Deep Water Bay and Repulse Bay AGI 0.0 0.0 0.0 1.7 9.5 11.0 0.9 0.0 0.9 0.0 0.0
ADI N/A N/A N/A 1.0 1.0 1.1 1.0 N/A 1.0 N/A N/A
Wanchai Tin Hau AGI 0.0 0.0 0.0 4.7 13.6 13.8 8.4 4.6 0.9 0.0 0.0
ADI N/A N/A N/A 1.6 1.9 2.7 1.8 1.0 2.0 N/A N/A
Wan Chai North AGI 0.0 0.0 0.0 2.7 8.1 7.1 0.9 1.0 1.9 0.9 0.0
ADI N/A N/A N/A 1.0 1.2 1.0 1.0 1.0 1.0 1.0 N/A
Happy Valley AGI 0.0 0.0 0.9 2.7 18.4 10.3 2.8 1.9 0.9 0.0% 0.0
ADI N/A N/A 1.0 1.0 1.5 1.3 1.0 1.0 1.0 N/A N/A
Islands (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Islands Cheung Chau South

 AGI 0.0 0.0 0.0 0.0 9.1 12.1 0.0 0.0 0.0 0.0 0.0
ADI N/A N/A N/A N/A 1.0 1.1 N/A N/A N/A N/A N/A
Cheung Chau North AGI 0.0 0.0 0.0 5.8 14.7 12.9 5.8 1.5 2.9 0.0 0.0
ADI N/A N/A N/A 1.0 1.7 1.4 1.3 4.0 1.0 N/A N/A
Tung Chung AGI 0.0 0.0 0.0 2.9 8.7 11.9 0.0 0.0 4.0 5.3 0.0
ADI N/A N/A N/A 1.0 1.2 1.2 N/A N/A 1.0 1.2 N/A
Kowloon (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Yau Tsim Tsim Sha Tsui AGI 0.0 0.0 0.0 1.6 4.9 4.7 4.7 0.8 0.0 0.0 0.0
ADI N/A N/A N/A 1.0 1.3 1.3 1.2 1.0 N/A N/A N/A
Tsim Sha Tsui East AGI 0.0 0.0 0.0 0.9 14.6 15.8 3.8 1.9 1.9 4.7 0.0 0.0
ADI N/A N/A N/A 1.0 1.3 1.3 1.0 1.0 1.0 1.4 N/A N/A
Mong Kok Mong Kok AGI 0.0 0.0 0.0 1.7 2.5 4.3 2.5 0.0 0.0 2.5 0.0
ADI N/A N/A N/A 1.5 1.0 1.0 1.0 N/A N/A 1.7 N/A
Sham Shui Po Cheung Sha Wan AGI 0.0 0.0 0.0 1.8 8.0 13.4 6.4 3.6 1.8 1.8 0.9
ADI N/A N/A N/A 1.0 1.3 1.3 1.1 1.0 1.0 1.0 1.0
Lai Chi Kok AGI 0.0 0.0 0.0 1.8 7.1 10.1 3.6 1.8 1.8 2.7 0.0
ADI  N/A  N/A N/A 1.0 1.4 1.5 1.3 1.0 1.0 1.0 N/A
Sham Shui Po East AGI 0.0 0.0 0.0 4.7 11.3 9.2 4.6 1.9 1.0 0.0 0.0 0.0
ADI N/A N/A N/A 1.0 1.4 2.2 1.0 1.0 1.0 N/A N/A N/A
Kowloon City Ho Man Tin AGI 0.9 0.9 0.0 3.8

20.6

 19.4 1.9 0.0 2.9 2.8 0.0 0.9
ADI 1.0 1.0 N/A 1.0 1.4 1.3 1.0 N/A 1.0 1.0 N/A 1.0
Kowloon City North AGI 0.0 0.0 0.0 0.0 7.4 11.2 0.0 0.0 1.9 0.0 0.0
ADI N/A N/A N/A N/A 1.0 1.2 N/A N/A 1.0 N/A N/A
Hung Hom AGI 0.0 0.0 0.0 22.3 18.5 16.7 1.8 4.6 3.7 2.8 0.9
ADI N/A N/A N/A 1.6 1.3 1.2 1.0 1.4 1.3 1.3 1.0
Lok Fu West AGI 0.0 0.0 0.0 2.5 9.1 23.5 8.5 4.2 3.4 1.7 0.8 5.9
ADI N/A N/A N/A 1.0

1.5

 1.7 1.4 1.0 1.0 1.0 1.0 1.3
Kai Tak North AGI 1.3 0.0 1.3 5.3 7.8 11.7 6.7 7.6 2.5 1.4 0.0 1.3
ADI 1.0 N/A 1.0 1.0 1.2 1.2 1.0 1.0 1.0 1.0 N/A 1.0
Wong Tai Sin Wong Tai Sin Central AGI 0.0 0.0 0.0 1.9 13.8 11.1 8.4 1.9 1.0 2.9 0.9
ADI N/A N/A N/A 1.0 1.3 1.8 1.0 1.0 1.0 1.0 1.0
Wong Tai Sin West AGI 0.9 0.0 0.0 1.9 21.3 13.0 7.4 1.9 0.0 0.0 0.0
ADI 1.0 N/A N/A 1.0 1.0 1.3 1.4 1.0 N/A N/A N/A
Diamond Hill AGI 0.0 0.0 0.0 2.6 13.8 14.8 4.5 0.9 0.9 0.0 0.0
ADI N/A N/A N/A 1.0 1.0 1.0 1.0 1.0 1.0 N/A N/A
Ngau Chi Wan AGI 0.0 0.0 0.0 2.8 14.7 25.7 7.5 6.6 6.6 1.9 0.0
ADI N/A N/A N/A 1.0 1.4 1.6 1.3 1.1 1.0 1.0 N/A
Kwun Tong Kwun Tong Central AGI 0.0 0.0 0.0 9.4 9.7 17.5 10.3 3.2 0.0 1.6 1.6
ADI N/A N/A N/A 1.0 1.2 1.3 1.2 1.0 N/A 1.0 1.0
Lam Tin AGI 0.0 0.0 0.0 0.9 9.5 14.2 2.5 0.0 1.8 2.7 4.3
ADI N/A N/A N/A 1.0 1.1 1.1 1.0 N/A 1.0 2 1.2
Yau Tong AGI 0.0 0.0 0.0 8.2 23.0 24.3 2.7 4.0 0.0 1.4 0.0
ADI N/A N/A N/A 1.0 1.2 1.4 1.0 1.0 N/A 1.0 N/A
Kowloon Bay AGI 0.8 0.0 0.8 4.0 8.1 5.7 3.2 1.6 0.0 1.7 0.0 0.0
ADI 1.0 N/A 1.0 1.0 1.0 1.6 1.0 1.0 N/A 1.0 N/A N/A
New Territories (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Sai Kung Tseung Kwan O West
 AGI 0.0 0.9 0.0 9.3 11.8 13.6 5.5 0.0 0.0 0.0 0.0
ADI N/A 1.0 N/A 1.0 1.0 1.4 1.3 N/A N/A N/A N/A
Tseung Kwan O East AGI 0.0 0.0 0.0 2.7 6.3 12.1 4.6 3.7 2.7 3.6 0.0
ADI N/A N/A N/A 1.3 1.1 1.1 1.0 1.0 1.3 1.3 N/A
Tseung Kwan O North AGI 0.0 0.0 0.0 2.3 21.6 24.1 10.6 10.3 3.4 3.5 1.1
ADI N/A N/A N/A 1.0 1.2 1.6 1.6 1.1 1.0 1.3 1.0
Sai Kung Town AGI 1.9 0.0 0.0 11.0 25.7 15.4 0.9 1.9 8.0 4.9 3.8 13.2
ADI 1.0 N/A N/A 1.0 1.6 1.3 1.0 1.5 1.0 1.0 1.3 1.5
Ngau Liu and Muk Min Shan AGI 2.0 6.0 2.0 4.0 10.0 6.1 0.0 4.0 0.0 0.0 0.0 2.0
ADI 1.0 1.0 1.0 1.0 2.0 1.3 N/A 1.0 N/A N/A N/A 1.0
Sha Tin Tai Wai AGI 0.0 0.0 0.0 1.6 9.9 13.8 7.6 0.0 0.0 5.9 4.2
ADI N/A N/A N/A 1.0 1.3 1.1 1.1 N/A N/A 1.4 1.2
Sha Tin East AGI 0.0 0.0 0.8 5.0 8.1 13.7 4.8 5.7 2.4 1.6 0.0
ADI N/A N/A 1.0 1.0 1.2 1.3 1.0 1.0 1.0 1.0 N/A
Ma On Shan AGI 1.6 0.8 2.4 15.9 19.7 26.8 12.7 3.2 3.2 4.7 4.7
ADI 1.0 1.0 1.0 1.4 1.2 1.1 1.1 1.0 1.0 1.2 1.0
Sha Tin Town Centre and Fo Tan AGI 0.0 0.0 0.0 1.9 19.3 14.4 5.5 1.9 0.9 0.0 0.0
ADI N/A N/A N/A 1.0 1.2 1.4 1.0 1.5 1.0 N/A N/A
Tai Po Tai Po West AGI 0.0 0.0 0.9 6.1 18.1 12.1 4.3 2.6 2.6 0.9 0.9
ADI N/A N/A 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Tai Po East AGI 0.0 0.0 0.0 2.9 8.2 5.8 1.9 2.9 1.0 1.0 0.0 0.0
ADI N/A N/A N/A 1.3 1.3 1.2 1.0 1.0 1.0 2.0 N/A N/A
North Fanling AGI 0.0 0.0

0.0

 0.9 9.0 12.8 2.7 0.0 1.9 5.7 0.0 1.9
ADI N/A N/A N/A 2.0 1.1 1.2 1.0 N/A 1.0 1.0 N/A 1.5
Sheung Shui AGI 1.7 0.8 1.6 13.8 42.9 54.4 13.0 3.2 5.6 9.1 1.6

0.0
ADI 1.5 1.0 1.0 1.3 2.5 2.5 1.2 1.8 1.0 1.2 1.0 N/A
Yuen Long Tin Shui Wai AGI 0.0 0.0 0.0 2.4 13.7 10.3 7.1 1.6 4.0 6.4 0.0
ADI N/A N/A N/A 1.0 1.1 1.0 1.0 1.0 1.0 1.0 N/A
Yuen Kong AGI 0.0 0.0 0.0 0.0 8.2 4.0 0.0 0.0 2.0 0.0 0.0
ADI N/A N/A N/A N/A 1.0 1.0 N/A N/A 1.0 N/A N/A
Yuen Long Town AGI 0.0 0.0 0.0 1.0 3.0 3.0 2.9 0.0 0.0 0.0 0.0
ADI N/A N/A N/A 1.0 1.0 1.0 1.3 N/A N/A N/A N/A
Ki Lun Shan AGI 0.0 0.0 0.0 8.5 8.0 4.2 2.0 0.0 4.1 0.0 0.0
ADI N/A N/A N/A 1.3 1.3 1.0 1.0 N/A 1.0 N/A N/A
Sung Shan AGI 0.0 0.0 0.0 6.3 22.4 8.3 4.2 2.1 4.2 0.0 0.0
ADI N/A N/A N/A 1.0 1.5 1.0 1.0 1.0 1.0 N/A N/A
Tuen Mun Tuen Mun North AGI 0.0 0.0 0.0 4.8 14.3 12.9 0.8 0.8 0.0 0.8 0.0
ADI N/A N/A N/A 1.2 1.2 1.4 1.0 1.0 N/A 1.0 N/A
Tuen Mun South AGI 0.0 0.0 0.0 2.9 6.6 13.5 3.7 6.5 3.8 2.9 0.9
ADI N/A N/A N/A 1.3 1.1 1.2 1.0 1.0 1.0 1.0 1.0
Tuen Mun West AGI 0.0 3.3 0.0 0.0 6.2 12.8 2.1 2.2 2.1 0.0 1.0
ADI N/A 1.3 N/A N/A 1.3 1.4 1.5 1.0 1.0 N/A 1.0
So Kwun Wat AGI 1.8 0.0 0.9 6.6 22.6 29.6 1.7 4.4 1.7 0.9 0.0 4.3
ADI 1.0 N/A 1.0 1.0 1.5 1.6 1.0 1.0 1.0 1.0 N/A 1.2
Tsuen Wan Tsuen Wan Town AGI 0.0 0.0 0.0 1.8 6.0 12.4 6.1 2.5 1.7 1.8 0.0 0.0
ADI N/A N/A N/A 1.0 1.3 1.1 1.1 1.0 1.0 1.0 N/A N/A
Tseun Wan West AGI 0.0 0.0 0.9 12.4 24.3 12.5 4.8 3.0 1.9 1.0 0.9 0.0
ADI N/A N/A 1.0 1.2 1.5 1.0 1.0 1.0 1.0 1.0 1.0 N/A
Ma Wan AGI 0.0 0.0 0.0 6.3 4.0 18.0 2.0 0.0 0.0 2.0 0.0 0.0
ADI N/A N/A N/A 1.0 1.0 1.4 1.0 N/A N/A 1.0 N/A N/A
Sheung Kwai Chung AGI 0.0 0.0 0.0 1.9 23.9 5.7 0.9 5.6 2.8 0.9 0.0 0.0
ADI N/A N/A N/A 1.0 1.4 1.3 1.0 1.0 1.0 1.0 N/A N/A
Kwai Tsing Kwai Chung AGI 0.0 0.0 0.0 0.8 13.6 12.0 4.2 0.9 0.9 0.9 0.0
ADI N/A N/A N/A 1.0 1.1 1.0 1.0 1.0 1.0 1.0 N/A
Lai King AGI 0.0 0.0 0.0 0.9 14.9 20.4 3.9 2.0 1.9 1.0 0.9 0.0
ADI N/A N/A N/A 1.0 1.3 1.2 1.0 1.0 1.0 1.0 1.0 N/A
Tsing Yi South AGI 0.0 0.0 0.0 7.1 12.6 10.8 5.4 4.5 3.6 1.7 0.9
ADI N/A N/A N/A 1.1 1.0 1.1 1.2 1.0 1.3 1.0 1.0
Tsing Yi North AGI 0.0 2.8 0.0 1.9 14.7 13.6 4.6 4.6 5.6 1.9 1.9
ADI N/A 1.0 N/A 1.0 1.3 2.1 1.2 1.0 1.0 1.5 1.0

Index value remarks：

Colour Gravidtrap Index Density Index
Green：Level I Gravidtrap Index < 5.0% [indicates that the distribution of Aedes albopictus is not extensive] 1.0 ≤ Density Index ≤ 1.5 [Aedes albopictus is not abundant in the locations with positive Gravidtraps]
Yellow：Level II 5.0% ≤ Gravidtrap Index < 20.0% [indicates that the distribution of Aedes albopictus is fairly extensive] 1.6 ≤ Density Index ≤ 2.4 [Aedes albopictus is slightly abundant in the locations with positive Gravidtraps]
Red：Level III 20.0% ≤ Gravidtrap Index < 40.0% [indicates that the distribution of Aedes albopictus is extensive]

Density Index ≥ 2.5 [Aedes albopictus is abundant in the locations with positive Gravidtraps]
Purple：Level IV Gravidtrap Index ≥ 40.0% [indicates that the distribution of Aedes albopictus is very extensive]

Number of areas in respective levels of Survey Area Gravidtrap Indices in 2024 are provided below:

Number of survey areas recorded with
respective Index Level 		 Total number of survey areas Top 5 survey areas at level 3 Top 5 survey areas at level 4
Level 1 Level 2 Level 3 Level 4
0%-<5% 5%-<20% 20%-<40% ≥40%
Jan 64 0 0 0 64 Nil Nil
Feb 63 1 0 0 64 Nil Nil
Mar 64 0 0 0 64 Nil Nil
Apr 46 17 1 0 64 1. Hung Hom Nil
May 4 50 9 1 64 1. Sai Kung Town
2. Tsuen Wan West
3. Sheung Kwai Chung
4. Yau Tong
5. So Kwun Wat		 1. Sheung Shui
Jun 5 51 7 1 64 1. So Kwun Wat
2. Ma On Shan
3. Ngau Chi Wan
4. Yau Tong
5. Tseung Kwan O North		 1. Sheung Shui
Jul 43 21 0 0 64 Nil Nil
Aug 55 9 0 0 64 Nil Nil
Sep 60 4 0 0 64 Nil Nil
Oct 59 5 0 0 64 Nil Nil
Nov 64 0 0 0 64 Nil Nil

Number of survey areas recorded with Area Gravidtrap Index reaching level III and Level IV in 2024 is provided below:

umber of survey areas recorded with Area Gravidtrap Index reaching level III and Level IV in 2024

Please click here for annual hotspot map on survey locations with Area Gravidtrap Index (AGI) reaching Level III and Level IV.

Comparison of Monthly Gravidtrap Index and Monthly Density Index for Aedes albopictus (2021 to 2023 and 2024) are provided below:

Comparision of Monthly Density Index and Monthly Density Index for Aedes albopictus (2021 to 2023 and 2024)

Comparision of Monthly Density Index and Monthly Density Index for Aedes albopictus (2021 to 2023 and 2024)

Information of Major Port Areas

The Port Monthly Gravidtrap Index and the Port Monthly Density Index for Aedes albopictus for November 2024 are 0.4% and 1.1 respectively.

Port Gravidtrap Indices and Port Density Indices for Aedes albopictus in 2024 are provided below:

Port areas (Map)
Port Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hong Kong International Airport PGI 0.0% 0.0% 0.0% 0.3% 1.1% 1.0% 0.3% 0.2% 0.1% 0.4% 0.1%
PDI N/A N/A N/A 1.1 1.2 1.2 1.0 1.0 1.0 1.1 1.0
Cross Boundary Check Points on Land PGI 0.4% 0.0% 0.3% 5.2% 10.6% 7.7% 3.9% 3.9% 3.7% 2.1% 1.1%
PDI 1.0 N/A 1.0 1.4 1.4 1.4 1.1 1.1 1.3 1.3 1.3
Private Cargo Working Areas PGI 0.3% 0.0% 0.6% 2.9% 10.1% 12.0% 3.8% 4.5 2.5% 0.7% 0.6%
PDI 1.0 N/A 1.0 1.1 1.1 1.2 1.0 1.1 1.1 1.0 1.0
Cross Boundary Ferry Terminals PGI 0.0% 0.0% 0.5% 0.0% 2.0% 1.5% 2.8% 2.2% 1.0% 0.7% 0.6%
PDI N/A N/A 1.0 N/A 1.0 1.0 1.0 1.0 1.3 1.0 1.0
Container Terminals PGI 0.0% 0.0% 0.1% 0.6% 2.0% 1.7% 0.0% 0.0% 0.2% 0.2% 0.0%
PDI N/A N/A 1.0 1.0 1.2 1.0 N/A N/A 1.0 1.0 N/A
Public Cargo Working Areas PGI 0.2% 0.0% 0.4% 2.9% 12.7% 10.6% 5.7% 4.3% 4.0% 2.3% 1.2%
PDI 1.0 N/A 1.0 1.2 1.3 1.2 1.1 1.0 1.1 1.0 1.0

Index value remarks：

Colour Gravidtrap Index Density Index
Green：Level I Gravidtrap Index < 5.0% [indicates that the distribution of Aedes albopictus is not extensive] 1.0 ≤ Density Index ≤ 1.5 [Aedes albopictus is not abundant in the locations with positive Gravidtraps]
Yellow：Level II 5.0% ≤ Gravidtrap Index < 20.0% [indicates that the distribution of Aedes albopictus is fairly extensive] 1.6 ≤ Density Index ≤ 2.4 [Aedes albopictus is slightly abundant in the locations with positive Gravidtraps]
Red：Level III 20.0% ≤ Gravidtrap Index  < 40.0% [indicates that the distribution of Aedes albopictus is extensive]

Density Index ≥ 2.5 [Aedes albopictus is abundant in the locations with positive Gravidtraps]
Purple：Level IV Gravidtrap Index ≥ 40.0% [indicates that the distribution of Aedes albopictus is very extensive]

Historical information in respect of  Ovitrap indices, Gravidtrap Indices and Density Indices 

Please click here for the Monthly Ovitrap Index, Gravidtrap Index and Density Index for Aedes albopictus from 2013 to 2023.

Please click here for a graph of comparison of Monthly Ovitrap Index for Aedes albopictus: 2010 to 2019 and 2020.

Please click here for a graph of comparison of Monthly Gravidtrap Index for Aedes albopictus: 2020 to 2022 and 2023.

Please click here for a graph of comparison of Monthly Density Index for Aedes albopictus: 2020 to 2022 and 2023.

Please click here for the Port Monthly Ovitrap Index, Gravidtrap Index and Density Index for Aedes albopictus from 2013 to 2023.