![green trees line both banks of the sacramento river. the yellow tower bridge crosses the blue water leading to the tall buildings of the sacrament skyline. the scene is set against a clear blue sky.](/sites/default/files/styles/hero/public/images/iStock_000007305532Medium.jpg?h=bc70f4df&itok=yyMstC8e)
Emission Inventory - Natural Sources
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Natural Sources are non-manmade emission sources, which include biological and geological sources, wildfires, windblown dust, and biogenic emissions from plants and trees.
Areawide Source Methodologies
Find out how ARB calculates emissions from natural source categories.
- Biogenic Sources
- Wildfire Sources
- Smoke Emission Estimation
- Geogenic Sources
Biogenic Emissions Inventory
ARB estimates emissions of biogenic volatile organic compounds (BVOCs) from vegetation for natural areas, crops, and urban vegetation. BVOC emissions are functions of the species leaf mass, emission factors, temperature, and light conditions.