Area Gravidtrap Indices and Density Indices for Aedes albopictus for the 62 survey areas in 2026 are provided below:

Hong Kong Island (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Central and Western Central and Admiralty AGI 0.0
ADI N/A
Kennedy Town and Shek Tong Tsui AGI 0.0
ADI N/A
Sheung Wan and Sai Ying Pun AGI 0.0
ADI N/A
Eastern Chai Wan AGI 0.0
ADI N/A
North Point and Quarry Bay AGI 0.0
ADI N/A

Shau Kei Wan and Sai Wan Ho

 AGI 0.9
ADI 1.0
Southern Aberdeen and Ap Lei Chau AGI 0.0
ADI N/A
Deep Water Bay and Repulse Bay AGI 0.0
ADI N/A
Pokfulam AGI 0.0
ADI N/A
Wan Chai Happy Valley and Tai Hang AGI 0.0
ADI N/A
Tin Hau and Causeway Bay AGI 0.0
ADI N/A
Wan Chai AGI 0.0
ADI N/A
Islands (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Islands Cheung Chau AGI 0.0
ADI N/A
Tung Chung AGI 0.0
ADI N/A
Kowloon (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Kowloon City Ho Man Tin AGI 0.0
ADI N/A
Hung Hom and To Kwa Wan AGI 1.8
ADI 1.0
Kai Tak AGI 0.0
ADI N/A
Kowloon City AGI 0.0
ADI N/A
Kowloon Tong AGI 0.0
ADI N/A
Kwun Tong Kowloon Bay AGI 0.0
ADI N/A
Kwun Tong Central AGI 0.0
ADI N/A
Lam Tin and Sau Mau Ping AGI 0.0
ADI N/A
Yau Tong and Cha Kwo Ling AGI 0.0
ADI N/A
Mong Kok Mong Kok and Tai Kok Tsui AGI 0.0
ADI N/A
Sham Shui Po Cheung Sha Wan AGI 0.0
ADI N/A
Lai Chi Kok AGI 0.0
ADI N/A
Sham Shui Po and Shek Kip Mei AGI 0.0
ADI N/A
Wong Tai Sin Diamond Hill and Tsz Wan Shan AGI 0.0
ADI N/A
Ngau Chi Wan and San Po Kong AGI 0.0
ADI N/A
Wong Tai Sin East AGI 0.0
ADI N/A
Wong Tai Sin West AGI 0.0
ADI N/A
Yau Tsim Tsim Sha Tsui and Yau Ma Tei AGI 0.0
ADI N/A
Tsim Sha Tsui East and King's Park AGI 0.0
ADI N/A
New Territories East (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
North Fanling North AGI 0.0
ADI N/A
Fanling South AGI 0.0
ADI N/A
Sheung Shui AGI 0.8
ADI 1.0
Sai Kung Sai Kung Town AGI 0.0
ADI N/A
Tseung Kwan O East AGI 0.0
ADI N/A
Tseung Kwan O North AGI 0.0
ADI N/A
Tseung Kwan O West
 AGI 0.0
ADI N/A
Sha Tin Ma On Shan AGI 0.0
ADI N/A
Sha Tin East AGI 0.0
ADI N/A
Sha Tin Town Centre and Fo Tan AGI 0.0
ADI N/A
Tai Wai AGI 0.0
ADI N/A
Tai Po Tai Po East AGI 1.1
ADI 1.0
Tai Po West AGI 0.0
ADI N/A
New Territories West (Map)
District Survey Area Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Kwai Tsing Kwai Chung East AGI 0.0
ADI N/A
Kwai Chung West AGI 0.0
ADI N/A
Lai King AGI 0.0
ADI N/A
Tsing Yi North AGI 0.0
ADI N/A
Tsing Yi South AGI 0.0
ADI N/A
Tsuen Wan Ma Wan and Sham Tseng AGI 0.9
ADI 1.0
Sheung Kwai Chung AGI 0.0
ADI N/A
Tsuen Wan Town AGI 0.0
ADI N/A
Tseun Wan West AGI 0.0
ADI N/A
Tuen Mun So Kwun Wat AGI 1.8
ADI 1.0
Tuen Mun North AGI 0.0
ADI N/A
Tuen Mun South AGI 0.0
ADI N/A
Tuen Mun West AGI 0.0
ADI N/A
Yuen Long Hung Shui Kiu and Ping Shan AGI 0.0
ADI N/A
Tin Shui Wai AGI 0.0
ADI N/A
Yuen Long Town AGI 0.0
ADI N/A

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 2026 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 62 0 0 0 62 Nil Nil

Number of survey areas recorded with Area Gravidtrap Index reaching level III and Level IV in 2026 is provided below:

umber of survey areas recorded with Area Gravidtrap Index reaching level III and Level IV in 2025

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 2025 and 2026) are provided below:

Comparision of Monthly Density Index and Monthly Density Index for Aedes albopictus (2021 to 2025 and 2026)

Comparision of Monthly Density Index and Monthly Density Index for Aedes albopictus (2021 to 2025 and 2026)

Information of Major Port Areas

The Port Monthly Gravidtrap Index and the Port Monthly Density Index for Aedes albopictus for December 2025 are 0.1 % and 1.0 respectively.

Port Gravidtrap Indices and Port Density Indices for Aedes albopictus in 2025 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 0.0 0.6 0.7 0.2 0.4 0.2 0.2 0.3 0.04
PDI N/A N/A N/A N/A 1.0 1.0 1.2 1.2 1.0 1.0 1.0 1.0
Cross Boundary Check Points on Land PGI 0.1 0.0 0.0 0.1 5.3 5.6 4.7 3.6 1.7 1.2 0.0 0.3
PDI 1.0 N/A N/A 1.0 1.2 1.1 1.1 1.2 1.2 1.0 N/A 1.0
Private Cargo Working Areas PGI 0.0 0.0 0.0 0.4 6.0 12.7 8.3 9.0 1.6 1.3 0.3 0.5
PDI N/A N/A N/A 1.0 1.1 1.1 1.2 1.1 1.0 1.2 1.0 1.0
Cross Boundary Ferry Terminals PGI 0.0 0.0 0.0 0.7 2.0 2.8 3.1 1.2 0.5 0.4 0.3 0.0
PDI N/A N/A N/A 1.0 1.0 1.0 1.1 1.0 1.0 1.0 1.0 N/A
Container Terminals PGI 0.0 0.0 0.0 0.2 0.4 1.2 0.5 0.2 0.3 0.3 0.0 0.2
PDI N/A N/A N/A 1.0 1.0 1.0 1.0 1.0 1.0 1.0 N/A 1.0
Public Cargo Working Areas PGI 0.0 0.0 0.0 0.8 5.6 7.6 10.3 9.1 3.3 1.4 1.1 0.0
PDI N/A N/A N/A 1.0 1.2 1.2 1.3 1.1 1.0 1.0 1.0 N/A

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 2024.

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 2023 and 2024.

Please click here for a graph of comparison of Monthly Density Index for Aedes albopictus: 2020 to 2023 and 2024.

Please click here for the Port Monthly Ovitrap Index, Gravidtrap Index and Density Index for Aedes albopictus from 2013 to 2024.