Natural (Non-Anthropogenic) Source Methodologies | California Air Resources Board

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.

Natural (Non-Anthropogenic) Source Methodologies

Area Source Categories

Geogenic Sources	Agency
Petroleum Seeps - Oil & Gas	CARB
Soil NOx and NH3	CARB

Wildfires	Agency
Wildfires - All Categories	CARB
Wildland Fire Use (WFU) Fires	CARB