Biomass burning in tropical and subtropical regions is a significant source of NO.,. as well as other chemically and radiatively important species such as C02, CO, CH4, NMHC, N20, and aerosols. Recent estimates of NOx emissions are based on emission factors from laboratory as well as field measurements of burning vegetation coupled with biomass inventories, land-use data, estimates of tropical deforestation, and occurrence of wild fires. Burning in the tropical latitudes is estimated to account for approximately 87% of the global total with Africa, South America, and Asia accounting for approximately 42, 23, and 28%, respectively. Thus far, however, laboratory mass-balance experiments can only account for approximately 30 to 50% of the fuel nitrogen that is released from this burning. Much of the missing
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