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 July 2026 was Cheung Sha Wan at 32.1% — Level III (20%-<40%, meaning the mosquito is widely distributed) — followed by Kai Tak at 24.2% and Ma On Shan at 22.7%. Twenty 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 2026-07), Cheung Sha Wan recorded the highest area gravidtrap index for the month at 32.1%, with 20 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 |
|---|---|---|---|---|---|---|---|---|
| Sham Shui Po | Cheung Sha Wan | 0.0 | 0.0 | 0.9 | 8.5 | 25.7 | 29.2 | 32.1 |
| Kowloon City | Kai Tak | 0.0 | 0.0 | 1.0 | 10.6 | 12.8 | 9.4 | 24.2 |
| Sha Tin | Ma On Shan | 0.0 | 0.0 | 1.6 | 16.4 | 31.0 | 18.5 | 22.7 |
| Eastern | Shau Kei Wan and Sai Wan Ho | 0.9 | 0.0 | 0.0 | 12.6 | 17.0 | 14.3 | 19.6 |
| Tai Po | Tai Po East | 1.1 | 0.0 | 0.0 | 34.7 | 10.2 | 6.7 | 19.6 |
| Kwun Tong | Lam Tin and Sau Mau Ping | 0.0 | 0.0 | 0.8 | 9.4 | 27.7 | 40.2 | 18.4 |
| Kowloon City | Hung Hom and To Kwa Wan | 1.8 | 0.0 | 1.8 | 6.1 | 17.2 | 7.9 | 18.1 |
| Eastern | Chai Wan | 0.0 | 0.0 | 0.8 | 7.3 | 15.4 | 16.9 | 16.3 |
| Kwai Tsing | Lai King | 0.0 | 0.0 | 1.0 | 6.6 | 26.9 | 8.7 | 16.3 |
| Yuen Long | Tin Shui Wai | 0.0 | 0.0 | 1.0 | 6.1 | 13.0 | 17.2 | 16.2 |
| Central and Western | Sheung Wan and Sai Ying Pun | 0.0 | 0.0 | 1.8 | 3.5 | 20.5 | 8.8 | 16.1 |
| Kwai Tsing | Kwai Chung West | 0.0 | 0.0 | 0.0 | 4.5 | 17.8 | 16.7 | 15.6 |
| Tai Po | Tai Po West | 0.0 | 0.0 | 0.0 | 7.0 | 16.4 | 16.8 | 15.5 |
| Wong Tai Sin | Diamond Hill and Tsz Wan Shan | 0.0 | 0.0 | 0.8 | 8.4 | 16.7 | 15.8 | 15.0 |
| Southern | Aberdeen and Ap Lei Chau | 0.0 | 0.0 | 0.9 | 6.5 | 20.8 | 9.2 | 14.7 |
| North | Fanling South | 0.0 | 0.0 | 0.0 | 8.4 | 14.9 | 18.2 | 14.4 |
| Eastern | North Point and Quarry Bay | 0.0 | 0.0 | 0.0 | 6.8 | 18.9 | 9.9 | 13.8 |
| Yuen Long | Yuen Long Town | 0.0 | 0.0 | 0.0 | 5.2 | 18.1 | 6.9 | 13.2 |
| Tuen Mun | So Kwun Wat | 1.8 | 0.0 | 1.8 | 19.3 | 20.5 | 6.1 | 11.7 |
| Kwai Tsing | Tsing Yi North | 0.0 | 0.0 | 0.8 | 8.4 | 30.0 | 6.8 | 10.2 |
| Sham Shui Po | Lai Chi Kok | 0.0 | 0.0 | 0.0 | 4.4 | 9.0 | 8.3 | 9.2 |
| Wong Tai Sin | Ngau Chi Wan and San Po Kong | 0.0 | 0.0 | 0.0 | 17.8 | 14.7 | 11.1 | 9.2 |
| Tuen Mun | Tuen Mun South | 0.0 | 0.0 | 0.9 | 11.8 | 15.5 | 7.3 | 9.2 |
| Kowloon City | Kowloon Tong | 0.0 | 1.7 | 2.5 | 8.5 | 23.4 | 10.8 | 9.1 |
| Tsuen Wan | Ma Wan and Sham Tseng | 0.9 | 0.0 | 0.9 | 4.6 | 26.2 | 9.5 | 9.1 |
| Tuen Mun | Tuen Mun West | 0.0 | 0.0 | 0.0 | 17.3 | 12.4 | 3.0 | 9.1 |
| Kowloon City | Ho Man Tin | 0.0 | 0.0 | 0.9 | 5.3 | 23.6 | 14.0 | 8.9 |
| North | Sheung Shui | 0.8 | 0.0 | 0.0 | 20.3 | 29.3 | 10.0 | 8.9 |
| Wong Tai Sin | Wong Tai Sin East | 0.0 | 0.0 | 0.0 | 9.8 | 16.7 | 15.8 | 8.6 |
| Tsuen Wan | Tseun Wan West | 0.0 | 0.0 | 0.0 | 4.0 | 28.6 | 6.5 | 8.5 |
| Sai Kung | Tseung Kwan O West | 0.0 | 0.0 | 0.0 | 6.4 | 8.4 | 8.2 | 8.2 |
| Sai Kung | Tseung Kwan O North | 0.0 | 0.0 | 1.1 | 13.6 | 35.3 | 12.9 | 8.0 |
| Central and Western | Kennedy Town and Shek Tong Tsui | 0.0 | 0.0 | 0.0 | 6.7 | 16.8 | 7.4 | 7.6 |
| Sai Kung | Tseung Kwan O East | 0.0 | 0.0 | 0.0 | 8.9 | 27.0 | 3.4 | 7.5 |
| Sha Tin | Sha Tin Town Centre and Fo Tan | 0.0 | 0.0 | 0.0 | 9.3 | 18.3 | 11.0 | 7.5 |
| Kwai Tsing | Kwai Chung East | 0.0 | 0.0 | 0.0 | 15.2 | 7.2 | 7.0 | 7.2 |
| Kwun Tong | Kowloon Bay | 0.0 | 0.0 | 0.0 | 9.8 | 28.9 | 8.8 | 7.1 |
| Kwai Tsing | Tsing Yi South | 0.0 | 0.0 | 0.0 | 8.8 | 15.0 | 7.9 | 7.1 |
| Tsuen Wan | Tsuen Wan Town | 0.0 | 0.0 | 0.0 | 5.2 | 6.9 | 8.5 | 6.9 |
| Southern | Pokfulam | 0.0 | 0.0 | 0.0 | 4.3 | 15.2 | 13.3 | 6.8 |
| Central and Western | Central and Admiralty | 0.0 | 0.0 | 1.0 | 0.0 | 14.2 | 3.8 | 6.7 |
| Yau Tsim | Tsim Sha Tsui East and King's Park | 0.0 | 0.0 | 0.0 | 2.8 | 9.1 | 6.5 | 6.5 |
| Yau Tsim | Tsim Sha Tsui and Yau Ma Tei | 0.0 | 0.0 | 0.0 | 7.1 | 4.8 | 0.0 | 6.3 |
| Wan Chai | Tin Hau and Causeway Bay | 0.0 | 0.0 | 0.0 | 7.6 | 8.8 | 8.3 | 5.8 |
| Tuen Mun | Tuen Mun North | 0.0 | 0.0 | 0.0 | 7.3 | 9.4 | 6.3 | 5.5 |
| Wan Chai | Happy Valley and Tai Hang | 0.0 | 0.0 | 1.8 | 3.5 | 16.7 | 4.3 | 5.1 |
| Sha Tin | Sha Tin East | 0.0 | 0.0 | 0.8 | 4.1 | 19.0 | 8.9 | 5.0 |
| Sham Shui Po | Sham Shui Po and Shek Kip Mei | 0.0 | 0.0 | 0.0 | 5.7 | 26.2 | 3.3 | 4.9 |
| Kwun Tong | Kwun Tong Central | 0.0 | 0.0 | 0.0 | 2.4 | 37.3 | 14.1 | 4.8 |
| Islands | Cheung Chau | 0.0 | 0.0 | 0.9 | 7.3 | 12.0 | 9.3 | 4.7 |
| Kowloon City | Kowloon City | 0.0 | 0.0 | 0.0 | 7.4 | 10.3 | 5.6 | 4.7 |
| Tsuen Wan | Sheung Kwai Chung | 0.0 | 0.0 | 1.0 | 4.7 | 10.3 | 7.3 | 4.5 |
| Wong Tai Sin | Wong Tai Sin West | 0.0 | 0.0 | 1.0 | 2.8 | 18.1 | 6.5 | 3.8 |
| Wan Chai | Wan Chai | 0.0 | 0.0 | 0.0 | 4.5 | 5.5 | 4.5 | 3.7 |
| Southern | Deep Water Bay and Repulse Bay | 0.0 | 0.0 | 0.0 | 5.9 | 12.5 | 7.5 | 3.4 |
| Yuen Long | Hung Shui Kiu and Ping Shan | 0.0 | 0.0 | 0.0 | 3.2 | 14.3 | 5.3 | 3.2 |
| Sai Kung | Sai Kung Town | 0.0 | 0.0 | 5.7 | 16.8 | 22.1 | 11.3 | 2.9 |
| Kwun Tong | Yau Tong and Cha Kwo Ling | 0.0 | 0.0 | 0.0 | 0.9 | 16.2 | 10.3 | 2.7 |
| Islands | Tung Chung | 0.0 | 0.0 | 0.0 | 1.0 | 4.0 | 4.9 | 1.0 |
| Mong Kok | Mong Kok and Tai Kok Tsui | 0.0 | 0.0 | 0.0 | 1.7 | 0.9 | 3.4 | 0.8 |
| North | Fanling North | 0.0 | 0.0 | 0.0 | 2.4 | 13.1 | 2.4 | 0.0 |
| Sha Tin | Tai Wai | 0.0 | 0.0 | 0.0 | 5.0 | 24.2 | 4.8 | 0.0 |
Compiled by Averta; not an official FEHD page. Source: FEHD's 2026 gravidtrap index record (data checked on this page: 2026-08-19; covers data through 2026-07). 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 district-level 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 district-level 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.