Tai'an City is situated at the south of Taishan Mountain. Taishan Mountain belongs to the monsoon climate of the warm Temperate Zone, with clear changes in altitudinal zonality, the lower part is the warm zone, and the top is the mesothermal zone. The favorable climatic conditions make Taishan Mountain be covered with thick vegetation, luxuriant forests, flourishing flowers and plants; which make up of a high afforestation coverage rate of 79.9%, all of these are seldom seen in mountainous scenic spots in northern area. There are numerous ancient and famous trees, among which more than 30 thousand trees are aged over a hundred praised as the "living cultural relics". Taishan Mountain is rich in biological resources in which the rare traditional medicinal herbs include Taishan glossy ganoderma, Polygonum multiflorum, Chinese gromwell, four-leaf ginseng, sealwort etc. In the gills and streams of Taishan Mountain lives a kind of rare fish specific in Taishan Mountain-Red Squama Fish, which is one of the animal species at the verge of extinction under the provincial protection. For many years, Tai'an City has always been stressing the importance of protecting the ecological environment, so that the afforestation coverage arte in the city has reached 33.05%, with an average of 7.34 square meters green land area per person. Tai'an City was honored the State Sanitary City in 1995.