Pollen Count & Forecast for Chiang Mai

Chiang Mai’s dry season (January–April) has high tree pollen levels; Teak (Tectona grandis) is dense on the slopes of Doi Suthep-Pui National Park; Mango (Mangifera indica) is found across urban gardens. Year-round Bermuda Grass (Cynodon dactylon) and Elephant Grass (Pennisetum purpureum) grow along the Ping River and in Buak Hard Public Park.

The surrounding mountains form a basin; this geography traps pollen and dust during the hot season. High humidity during the monsoon (June–October) increases Mould (Alternaria, Aspergillus) spore counts; these are common near Huay Tung Tao Lake and within damp forest environments.