MOSQUITO INDEX
Hong Kong Mosquito Index Tracker: Where Does Your Area Rank This Month?
Quick answer
Every month, the Food and Environmental Hygiene Department (FEHD) publishes an Aedes albopictus gravidtrap index (a monthly-consolidated figure) for 62 survey areas across Hong Kong. The highest reading for August 2026 was Lam Tin and Sau Mau Ping at 26.4% — Level III (20%-<40%, meaning the mosquito is widely distributed) — followed by Sheung Wan and Sai Ying Pun at 19.5% and Hung Hom and To Kwa Wan at 15.0%.
Nine survey areas across Hong Kong came in above 10%. The table below tracks all 62 areas month by month, sourced directly from FEHD's published figures.
According to FEHD data compiled by Averta Pest Control (as of 2026-08), Lam Tin and Sau Mau Ping recorded the highest area gravidtrap index for the month at 26.4%, with 9 of Hong Kong's 62 monitoring areas above 10%.
What does the index actually measure?
The gravidtrap index indicates how widely Aedes albopictus (the Asian tiger mosquito) is distributed within a survey area. It is not a mosquito headcount or a disease-risk assessment. FEHD groups the index into four levels:
| Level | Index range | What it means |
|---|---|---|
| Level I (green) | Below 5.0% | Not widely distributed |
| Level II (yellow) | 5.0% to below 20.0% | Fairly widely distributed |
| Level III (red) | 20.0% to below 40.0% | Widely distributed |
| Level IV (purple) | 40.0% or above | Very widely distributed |
Monthly-consolidated vs fortnightly-batch figures: This table shows FEHD's monthly-consolidated index, calculated across the whole month. During mosquito season, FEHD also publishes fortnightly batches of more recent figures, and the two sets can differ materially. For example, Lam Tin & Sau Mau Ping's June monthly-consolidated figure was 40.2%, while the final fortnightly batch in June was below 10%. Check which reporting period a figure represents before comparing it.
All 62 survey areas, month by month (2026)
| District | Survey area | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug |
|---|---|---|---|---|---|---|---|---|---|
| Kwun Tong | Lam Tin and Sau Mau Ping | 0.0 | 0.0 | 0.8 | 9.4 | 27.7 | 40.2 | 18.4 | 26.4 |
| Central and Western | Sheung Wan and Sai Ying Pun | 0.0 | 0.0 | 1.8 | 3.5 | 20.5 | 8.8 | 16.1 | 19.5 |
| Kowloon City | Hung Hom and To Kwa Wan | 1.8 | 0.0 | 1.8 | 6.1 | 17.2 | 7.9 | 18.1 | 15.0 |
| Kowloon City | Kai Tak | 0.0 | 0.0 | 1.0 | 10.6 | 12.8 | 9.4 | 24.2 | 14.6 |
| Yuen Long | Yuen Long Town | 0.0 | 0.0 | 0.0 | 5.2 | 18.1 | 6.9 | 13.2 | 13.6 |
| Wong Tai Sin | Diamond Hill and Tsz Wan Shan | 0.0 | 0.0 | 0.8 | 8.4 | 16.7 | 15.8 | 15.0 | 13.4 |
| Eastern | Chai Wan | 0.0 | 0.0 | 0.8 | 7.3 | 15.4 | 16.9 | 16.3 | 12.2 |
| Kwai Tsing | Tsing Yi North | 0.0 | 0.0 | 0.8 | 8.4 | 30.0 | 6.8 | 10.2 | 11.7 |
| Eastern | Shau Kei Wan and Sai Wan Ho | 0.9 | 0.0 | 0.0 | 12.6 | 17.0 | 14.3 | 19.6 | 10.7 |
| Kwai Tsing | Lai King | 0.0 | 0.0 | 1.0 | 6.6 | 26.9 | 8.7 | 16.3 | 9.6 |
| Kwun Tong | Kowloon Bay | 0.0 | 0.0 | 0.0 | 9.8 | 28.9 | 8.8 | 7.1 | 9.3 |
| Sham Shui Po | Cheung Sha Wan | 0.0 | 0.0 | 0.9 | 8.5 | 25.7 | 29.2 | 32.1 | 9.3 |
| Southern | Aberdeen and Ap Lei Chau | 0.0 | 0.0 | 0.9 | 6.5 | 20.8 | 9.2 | 14.7 | 9.1 |
| Kowloon City | Kowloon Tong | 0.0 | 1.7 | 2.5 | 8.5 | 23.4 | 10.8 | 9.1 | 9.0 |
| Sha Tin | Sha Tin Town Centre and Fo Tan | 0.0 | 0.0 | 0.0 | 9.3 | 18.3 | 11.0 | 7.5 | 8.6 |
| Sha Tin | Ma On Shan | 0.0 | 0.0 | 1.6 | 16.4 | 31.0 | 18.5 | 22.7 | 8.1 |
| Sha Tin | Sha Tin East | 0.0 | 0.0 | 0.8 | 4.1 | 19.0 | 8.9 | 5.0 | 8.1 |
| Kwai Tsing | Kwai Chung West | 0.0 | 0.0 | 0.0 | 4.5 | 17.8 | 16.7 | 15.6 | 7.8 |
| Sai Kung | Tseung Kwan O West | 0.0 | 0.0 | 0.0 | 6.4 | 8.4 | 8.2 | 8.2 | 7.3 |
| Tsuen Wan | Ma Wan and Sham Tseng | 0.9 | 0.0 | 0.9 | 4.6 | 26.2 | 9.5 | 9.1 | 7.3 |
| Tuen Mun | Tuen Mun South | 0.0 | 0.0 | 0.9 | 11.8 | 15.5 | 7.3 | 9.2 | 7.3 |
| Sham Shui Po | Lai Chi Kok | 0.0 | 0.0 | 0.0 | 4.4 | 9.0 | 8.3 | 9.2 | 7.1 |
| Southern | Pokfulam | 0.0 | 0.0 | 0.0 | 4.3 | 15.2 | 13.3 | 6.8 | 7.0 |
| Sai Kung | Tseung Kwan O North | 0.0 | 0.0 | 1.1 | 13.6 | 35.3 | 12.9 | 8.0 | 6.8 |
| Central and Western | Central and Admiralty | 0.0 | 0.0 | 1.0 | 0.0 | 14.2 | 3.8 | 6.7 | 6.7 |
| Kowloon City | Ho Man Tin | 0.0 | 0.0 | 0.9 | 5.3 | 23.6 | 14.0 | 8.9 | 6.5 |
| Wong Tai Sin | Ngau Chi Wan and San Po Kong | 0.0 | 0.0 | 0.0 | 17.8 | 14.7 | 11.1 | 9.2 | 6.4 |
| Yuen Long | Tin Shui Wai | 0.0 | 0.0 | 1.0 | 6.1 | 13.0 | 17.2 | 16.2 | 6.0 |
| North | Fanling South | 0.0 | 0.0 | 0.0 | 8.4 | 14.9 | 18.2 | 14.4 | 5.8 |
| Tsuen Wan | Sheung Kwai Chung | 0.0 | 0.0 | 1.0 | 4.7 | 10.3 | 7.3 | 4.5 | 5.5 |
| Kwun Tong | Yau Tong and Cha Kwo Ling | 0.0 | 0.0 | 0.0 | 0.9 | 16.2 | 10.3 | 2.7 | 5.4 |
| Wong Tai Sin | Wong Tai Sin East | 0.0 | 0.0 | 0.0 | 9.8 | 16.7 | 15.8 | 8.6 | 5.4 |
| Islands | Tung Chung | 0.0 | 0.0 | 0.0 | 1.0 | 4.0 | 4.9 | 1.0 | 5.2 |
| Kwai Tsing | Tsing Yi South | 0.0 | 0.0 | 0.0 | 8.8 | 15.0 | 7.9 | 7.1 | 5.2 |
| Tsuen Wan | Tsuen Wan Town | 0.0 | 0.0 | 0.0 | 5.2 | 6.9 | 8.5 | 6.9 | 5.1 |
| North | Sheung Shui | 0.8 | 0.0 | 0.0 | 20.3 | 29.3 | 10.0 | 8.9 | 4.9 |
| Kwun Tong | Kwun Tong Central | 0.0 | 0.0 | 0.0 | 2.4 | 37.3 | 14.1 | 4.8 | 4.8 |
| Central and Western | Kennedy Town and Shek Tong Tsui | 0.0 | 0.0 | 0.0 | 6.7 | 16.8 | 7.4 | 7.6 | 4.6 |
| Sham Shui Po | Sham Shui Po and Shek Kip Mei | 0.0 | 0.0 | 0.0 | 5.7 | 26.2 | 3.3 | 4.9 | 4.2 |
| Eastern | North Point and Quarry Bay | 0.0 | 0.0 | 0.0 | 6.8 | 18.9 | 9.9 | 13.8 | 4.1 |
| Sai Kung | Sai Kung Town | 0.0 | 0.0 | 5.7 | 16.8 | 22.1 | 11.3 | 2.9 | 3.9 |
| Tai Po | Tai Po East | 1.1 | 0.0 | 0.0 | 34.7 | 10.2 | 6.7 | 19.6 | 3.9 |
| Wan Chai | Tin Hau and Causeway Bay | 0.0 | 0.0 | 0.0 | 7.6 | 8.8 | 8.3 | 5.8 | 3.8 |
| Tuen Mun | So Kwun Wat | 1.8 | 0.0 | 1.8 | 19.3 | 20.5 | 6.1 | 11.7 | 3.6 |
| Kwai Tsing | Kwai Chung East | 0.0 | 0.0 | 0.0 | 15.2 | 7.2 | 7.0 | 7.2 | 3.5 |
| Southern | Deep Water Bay and Repulse Bay | 0.0 | 0.0 | 0.0 | 5.9 | 12.5 | 7.5 | 3.4 | 3.3 |
| Tuen Mun | Tuen Mun North | 0.0 | 0.0 | 0.0 | 7.3 | 9.4 | 6.3 | 5.5 | 3.1 |
| Tuen Mun | Tuen Mun West | 0.0 | 0.0 | 0.0 | 17.3 | 12.4 | 3.0 | 9.1 | 3.0 |
| Kowloon City | Kowloon City | 0.0 | 0.0 | 0.0 | 7.4 | 10.3 | 5.6 | 4.7 | 2.8 |
| Sai Kung | Tseung Kwan O East | 0.0 | 0.0 | 0.0 | 8.9 | 27.0 | 3.4 | 7.5 | 2.8 |
| Tsuen Wan | Tseun Wan West | 0.0 | 0.0 | 0.0 | 4.0 | 28.6 | 6.5 | 8.5 | 2.8 |
| Tai Po | Tai Po West | 0.0 | 0.0 | 0.0 | 7.0 | 16.4 | 16.8 | 15.5 | 2.7 |
| Wan Chai | Happy Valley and Tai Hang | 0.0 | 0.0 | 1.8 | 3.5 | 16.7 | 4.3 | 5.1 | 2.6 |
| Sha Tin | Tai Wai | 0.0 | 0.0 | 0.0 | 5.0 | 24.2 | 4.8 | 0.0 | 2.5 |
| Yau Tsim | Tsim Sha Tsui and Yau Ma Tei | 0.0 | 0.0 | 0.0 | 7.1 | 4.8 | 0.0 | 6.3 | 2.4 |
| Wong Tai Sin | Wong Tai Sin West | 0.0 | 0.0 | 1.0 | 2.8 | 18.1 | 6.5 | 3.8 | 2.0 |
| Islands | Cheung Chau | 0.0 | 0.0 | 0.9 | 7.3 | 12.0 | 9.3 | 4.7 | 1.8 |
| Mong Kok | Mong Kok and Tai Kok Tsui | 0.0 | 0.0 | 0.0 | 1.7 | 0.9 | 3.4 | 0.8 | 1.7 |
| Yuen Long | Hung Shui Kiu and Ping Shan | 0.0 | 0.0 | 0.0 | 3.2 | 14.3 | 5.3 | 3.2 | 1.2 |
| Wan Chai | Wan Chai | 0.0 | 0.0 | 0.0 | 4.5 | 5.5 | 4.5 | 3.7 | 0.9 |
| Yau Tsim | Tsim Sha Tsui East and King's Park | 0.0 | 0.0 | 0.0 | 2.8 | 9.1 | 6.5 | 6.5 | 0.0 |
| North | Fanling North | 0.0 | 0.0 | 0.0 | 2.4 | 13.1 | 2.4 | 0.0 | 0.0 |
Compiled by Averta; not an official FEHD page. Source: FEHD's 2026 gravidtrap index record (data checked on this page: 2026-09-15; covers data through 2026-08). Beyond the monthly index, FEHD also publishes fortnightly batches of the latest figures during mosquito season — this table shows the monthly consolidated index.
Your area's index is high — what should you do?
- Start with standing water — Aedes albopictus can breed in very small amounts of it: plant-pot saucers, open drain channels, rooftop clutter and air-conditioner drip trays. Checking and clearing standing water weekly is a practical first step.
- At the estate level — the index is a survey-area figure: podium gardens and shared drainage need the management office to follow up. That's exactly what our property management pest control service does.
- At the flat level — window screens, mosquito-repellent products and fans can help. If the issue persists, a source inspection is available at HK$350, fully credited when you book.
Need help assessing a mosquito problem?
Frequently asked questions
How often is the gravidtrap index updated?
FEHD publishes the survey-area consolidated index monthly, and during mosquito season (roughly March to November) also releases fortnightly batches of the latest figures. This page is updated in sync with each FEHD monthly release, with the check date shown at the bottom.
Does a high index mean a much greater chance of catching dengue fever?
The index measures how widely distributed Aedes albopictus is, not a disease-risk forecast. Aedes albopictus is a dengue vector, so whether your area's index is high or low, basic mosquito prevention like clearing standing water is worth doing either way.
Why did my area's index jump so fast?
The index can swing a lot month to month — rain, hot and humid weather, and the pace of standing-water clean-up all play a part. Rather than guessing at the cause, focus on what you can control: standing water at your flat and around the estate.