The Rodent Activity Survey (RAS) for the second half of 2025 has been completed in all districts, and the overall Rodent Absence Rate (RAR) is 96.1%, which is slightly higher than 96.0% in the first half of 2025, reflecting that the rodent infestation situation has remained stable.
For the first half of 2025, the number of survey locations across Hong Kong with RAR below 80% (i.e. more active rodent activities were observed) was 49. Of these, about 84% (41 locations) saw improvement in the second half of 2025, with 30 of them achieving RAR over 90%, reflecting significant improvement. Moreover, for the second half of 2025, the number of survey locations with RAR below 80% was 44, representing a drop by approximately 45% and 10% compared to the second half of 2024 (80 locations) and the first half of 2025 (49 locations), respectively, reflecting the positive effects of the targeted anti-rodent strategy and measures adopted by the Department after analysing the RARs.
Breakdown of the number of survey locations with RAR below 80% in the first half of 2025, compared to the survey results from the second half, are set out below:
| Rodent Absence Rate (RAR) of First Half of 2025 | Number of Survey Locations | Number of Survey Locations with Improvement in RAR in second half of 2025 Note | Percentage of Survey Locations with Improvement |
| Below 50% | 4 | 4(3) | 100% |
| 50% to below 60% | 3 | 3(2) | 100% |
| 60% to below 70% | 13 | 11(7) | 85% |
| 70% to below 80% | 29 | 23(18) | 79% |
Note : ( ) represents the number of survey locations where the RAR achieving 90% or above
The RAS results in 2025 of all districts are set out below:
|
District |
First half of 2025 | Second half of 2025 | ||
| RAR | Number of Survey Locations with RAR below 80% | RAR | Number of Survey Locations with RAR below 80% | |
|
Central and Western |
96.2% |
3 |
97.6% |
2 |
|
Eastern |
93.3% |
6 |
98.6% |
0 |
|
Southern |
98.4% |
0 |
97.3% |
1 |
|
Wan Chai |
91.4% |
9 |
92.4% |
12 |
|
Islands |
97.9% |
0 |
98.7% |
0 |
|
Kowloon City |
94.2% |
5 |
91.9% |
11 |
|
Kwun Tong |
97.7% |
0 |
97.2% |
0 |
|
Mong Kok |
94.6% |
5 |
96.9% |
0 |
|
Sham Shui Po |
96.1% |
3 |
94.9% |
5 |
|
Wong Tai Sin |
94.4% |
4 |
97.6% |
0 |
|
Yau Tsim |
96.0% |
4 |
94.5% |
5 |
|
North |
97.5% |
1 |
97.1% |
2 |
|
Sai Kung |
99.3% |
0 |
99.5% |
0 |
|
Sha Tin |
98.1% |
0 |
96.4% |
1 |
|
Tai Po |
98.7% |
0 |
97.9% |
1 |
|
Kwai Tsing |
96.5% |
4 |
97.2% |
0 |
|
Tsuen Wan |
93.6% |
5 |
96.7% |
2 |
|
Tuen Mun |
98.9% |
0 |
98.1% |
0 |
|
Yuen Long |
98.5% |
0 |
96.7% |
2 |
| Overall Rodent Absence Rate / Total |
96.0% |
49 |
96.1% |
44 |