Abstract: To clarify the pollution situation of biomass combustion sources in Hainan Province, we investigated the activity level data of biomass combustion sources in Hainan Province in 2019, established the emission inventory of seven pollutants from biomass combustion using the emission factor method, and analyzed spatiotemporal distribution and uncertainty of the emission inventory. The results showed that the emissions of CO, CO₂, SO₂, NO_X, NH₃, CH₄ and PM_2.5 from biomass combustion sources in Hainan Province in 2019 were 17779.77, 587732.18, 340.87, 1208.31, 308.69, 5674.55, and 4946.24 t, respectively. Open burning of rice straw had the highest contribution rate to CO, CO₂, SO₂, NO_X, NH₃, CH₄ and PM_2.5 emissions, while open burning of peanut and sugarcane straw had the highest contribution rate to CH₄ emissions. The distribution of air pollutant emissions from biomass combustion sources in Hainan Province was uneven. Haikou was the main emission area of pollution. The emission of air pollutants from biomass combustion sources in Hainan Province was uneven at the temporal perspective, and most of the emissions were concentrated in March, April, July and October, and mostly concentrated in the daily period of 3:00-6:00, 11:00-15:00 and 17:00-19:00. The uncertainty of CO₂ and NH₃ emissions from forest fires was the highest, being -29.5% to 28.5% and -27.7% to 29.6%, respectively. The uncertainty of CH₄ emission from open burning of straw was the lowest, being -15.5% to 12.5%.

Key words: emission inventory, biomass, Hainan Province, emission factor