Record of Indices in 2024

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
	Central and Admiralty	ADI	1.0	1.0	1.0	1.5	1.4	1.3	1.7	N/A	1.0	1.0
	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
	Sheung Wan and Sai Ying Pun	ADI	N/A	N/A	N/A	1.0	1.1	1.4	1.2	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
	Sai Wan	ADI	N/A	N/A	N/A	1.0	2.3	1.5	1.4	1.3	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
	Chai Wan West	ADI	1.0	N/A	1.0	1.1	1.0	1.1	1.0	1.0	1.0	1.0
	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
	Shau Kei Wan and Sai Wan Ho	ADI	N/A	N/A	N/A	1.0	1.0	1.5	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
	North Point	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
	Aberdeen and Ap Lei Chau	ADI	N/A	N/A	N/A	1.0	1.0	1.1	1.2	1.0	1.0	1.0
	Pokfulam	AGI	0.0	0.0	0.9	4.3	13.7	8.5	2.6	0.9	0.0	1.7
	Pokfulam	ADI	N/A	N/A	1.0	1.2	1.1	1.5	1.0	1.0	N/A	1.0
	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
	Deep Water Bay and Repulse Bay	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
	Tin Hau	ADI	N/A	N/A	N/A	1.6	1.9	2.7	1.8	1.0	2.0	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
	Wan Chai North	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%
	Happy Valley	ADI	N/A	N/A	1.0	1.0	1.5	1.3	1.0	1.0	1.0	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
	Cheung Chau South	ADI	N/A	N/A	N/A	N/A	1.0	1.1	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
	Cheung Chau North	ADI	N/A	N/A	N/A	1.0	1.7	1.4	1.3	4.0	1.0	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
	Tung Chung	ADI	N/A	N/A	N/A	1.0	1.2	1.2	N/A	N/A	1.0	1.2
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
	Tsim Sha Tsui	ADI	N/A	N/A	N/A	1.0	1.3	1.3	1.2	1.0	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
	Tsim Sha Tsui East	ADI	N/A	N/A	N/A	1.0	1.3	1.3	1.0	1.0	1.0	1.4
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
Mong Kok	Mong Kok	ADI	N/A	N/A	N/A	1.5	1.0	1.0	1.0	N/A	N/A	1.7
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
	Cheung Sha Wan	ADI	N/A	N/A	N/A	1.0	1.3	1.3	1.1	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
	Lai Chi Kok	ADI	N/A	N/A	N/A	1.0	1.4	1.5	1.3	1.0	1.0	1.0
	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
	Sham Shui Po East	ADI	N/A	N/A	N/A	1.0	1.4	2.2	1.0	1.0	1.0	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
	Ho Man Tin	ADI	1.0	1.0	N/A	1.0	1.4	1.3	1.0	N/A	1.0	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
	Kowloon City North	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
	Hung Hom	ADI	N/A	N/A	N/A	1.6	1.3	1.2	1.0	1.4	1.3	1.3
	Lok Fu West	AGI	0.0	0.0	0.0	2.5	9.1	23.5	8.5	4.2	3.4	1.7
	Lok Fu West	ADI	N/A	N/A	N/A	1.0	1.5	1.7	1.4	1.0	1.0	1.0
	Kai Tak North	AGI	1.3	0.0	1.3	5.3	7.8	11.7	6.7	7.6	2.5	1.4
	Kai Tak North	ADI	1.0	N/A	1.0	1.0	1.2	1.2	1.0	1.0	1.0	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
	Wong Tai Sin Central	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
	Wong Tai Sin West	ADI	1.0	N/A	N/A	1.0	1.0	1.3	1.4	1.0	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
	Diamond Hill	ADI	N/A	N/A	N/A	1.0	1.0	1.0	1.0	1.0	1.0	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
	Ngau Chi Wan	ADI	N/A	N/A	N/A	1.0	1.4	1.6	1.3	1.1	1.0	1.0
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
	Kwun Tong Central	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
	Lam Tin	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
	Yau Tong	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
	Kowloon Bay	ADI	1.0	N/A	1.0	1.0	1.0	1.6	1.0	1.0	N/A	1.0
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
	Tseung Kwan O West	ADI	N/A	1.0	N/A	1.0	1.0	1.4	1.3	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
	Tseung Kwan O East	ADI	N/A	N/A	N/A	1.3	1.1	1.1	1.0	1.0	1.3	1.3
	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
	Tseung Kwan O North	ADI	N/A	N/A	N/A	1.0	1.2	1.6	1.6	1.1	1.0	1.3
	Sai Kung Town	AGI	1.9	0.0	0.0	11.0	25.7	15.4	0.9	1.9	8.0	4.9
	Sai Kung Town	ADI	1.0	N/A	N/A	1.0	1.6	1.3	1.0	1.5	1.0	1.0
	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
	Ngau Liu and Muk Min Shan	ADI	1.0	1.0	1.0	1.0	2.0	1.3	N/A	1.0	N/A	N/A
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
	Tai Wai	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
	Sha Tin East	ADI	N/A	N/A	1.0	1.0	1.2	1.3	1.0	1.0	1.0	1.0
	Ma On Shan	AGI	1.6	0.8	2.4	15.9	19.7	26.8	12.7	3.2	3.2	4.7
	Ma On Shan	ADI	1.0	1.0	1.0	1.4	1.2	1.1	1.1	1.0	1.0	1.2
	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
	Sha Tin Town Centre and Fo Tan	ADI	N/A	N/A	N/A	1.0	1.2	1.4	1.0	1.5	1.0	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
	Tai Po West	ADI	N/A	N/A	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
	Tai Po East	ADI	N/A	N/A	N/A	1.3	1.3	1.2	1.0	1.0	1.0	2.0
North	Fanling	AGI	0.0	0.0	0.0	0.9	9.0	12.8	2.7	0.0	1.9	5.7
	Fanling	ADI	N/A	N/A	N/A	2.0	1.1	1.2	1.0	N/A	1.0	1.0
	Sheung Shui	AGI	1.7	0.8	1.6	13.8	42.9	54.4	13.0	3.2	5.6	9.1
	Sheung Shui	ADI	1.5	1.0	1.0	1.3	2.5	2.5	1.2	1.8	1.0	1.2
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
	Tin Shui Wai	ADI	N/A	N/A	N/A	1.0	1.1	1.0	1.0	1.0	1.0	1.0
	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
	Yuen Kong	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
	Yuen Long Town	ADI	N/A	N/A	N/A	1.0	1.0	1.0	1.3	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
	Ki Lun Shan	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
	Sung Shan	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
	Tuen Mun North	ADI	N/A	N/A	N/A	1.2	1.2	1.4	1.0	1.0	N/A	1.0
	Tuen Mun South	AGI	0.0	0.0	0.0	2.9	6.6	13.5	3.7	6.5	3.8	2.9
	Tuen Mun South	ADI	N/A	N/A	N/A	1.3	1.1	1.2	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
	Tuen Mun West	ADI	N/A	1.3	N/A	N/A	1.3	1.4	1.5	1.0	1.0	N/A
	So Kwun Wat	AGI	1.8	0.0	0.9	6.6	22.6	29.6	1.7	4.4	1.7	0.9
	So Kwun Wat	ADI	1.0	N/A	1.0	1.0	1.5	1.6	1.0	1.0	1.0	1.0
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
	Tsuen Wan Town	ADI	N/A	N/A	N/A	1.0	1.3	1.1	1.1	1.0	1.0	1.0
	Tseun Wan West	AGI	0.0	0.0	0.9	12.4	24.3	12.5	4.8	3.0	1.9	1.0
	Tseun Wan West	ADI	N/A	N/A	1.0	1.2	1.5	1.0	1.0	1.0	1.0	1.0
	Ma Wan	AGI	0.0	0.0	0.0	6.3	4.0	18.0	2.0	0.0	0.0	2.0
	Ma Wan	ADI	N/A	N/A	N/A	1.0	1.0	1.4	1.0	N/A	N/A	1.0
	Sheung Kwai Chung	AGI	0.0	0.0	0.0	1.9	23.9	5.7	0.9	5.6	2.8	0.9
	Sheung Kwai Chung	ADI	N/A	N/A	N/A	1.0	1.4	1.3	1.0	1.0	1.0	1.0
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
	Kwai Chung	ADI	N/A	N/A	N/A	1.0	1.1	1.0	1.0	1.0	1.0	1.0
	Lai King	AGI	0.0	0.0	0.0	0.9	14.9	20.4	3.9	2.0	1.9	1.0
	Lai King	ADI	N/A	N/A	N/A	1.0	1.3	1.2	1.0	1.0	1.0	1.0
	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
	Tsing Yi South	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
	Tsing Yi North	ADI	N/A	1.0	N/A	1.0	1.3	2.1	1.2	1.0	1.0	1.5

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

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)

Information of Major Port Areas

The Port Monthly Gravidtrap Index and the Port Monthly Density Index for Aedes albopictus for October 2024 are 0.9% 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%
Hong Kong International Airport	PDI	N/A	N/A	N/A	1.1	1.2	1.2	1.0	1.0	1.0	1.1
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%
Cross Boundary Check Points on Land	PDI	1.0	N/A	1.0	1.4	1.4	1.4	1.1	1.1	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%
Private Cargo Working Areas	PDI	1.0	N/A	1.0	1.1	1.1	1.2	1.0	1.1	1.1	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%
Cross Boundary Ferry Terminals	PDI	N/A	N/A	1.0	N/A	1.0	1.0	1.0	1.0	1.3	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%
Container Terminals	PDI	N/A	N/A	1.0	1.0	1.2	1.0	N/A	N/A	1.0	1.0
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%
Public Cargo Working Areas	PDI	1.0	N/A	1.0	1.2	1.3	1.2	1.1	1.0	1.1	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.