Haikou’s air quality index is the second highest one in China, which is only second to Kunming.
The groundwater is of international standard, and is classified as mineral water.
In 1995, the Haikou city government began an initiative to improve residents’ living quality .With the approval of the World Health Organization, and China's Ministry of Health, a ten-point plan was undertaken to address such issues as:
- Community health care
- Vaccinations for children
- Waste recycling
- Green belts and urban trees
- Environmentally friendly construction
- Public toilets
- Sewage treatment
- Noise pollution
By 2004, the city had established 43 new community health service centers covering 85 percent of the population. The initiative has increased the size of Haikou's green spaces to 2,000 hectares, with trees lining 40 percent of its roads. Noise pollution has dropped from 61.1db to 58.2db. 300 public toilets have been built. All industrial effluents, industrial waste water and solid waste, and all live sewage, is now processed through centralized treatment centers, and is disposed of without environmental impact. These improvements and others have increased life expectancy in Haikou to 78.26 years.
Haikou city has also built 163 model ecological villages. Now, over 200,000 villagers in 933 villages have tap water in their homes.