Source apportionment of PM2.5 organic carbon in the San Joaquin Valley using monthly and daily observations and meteorological clustering

Monthly averaged mass concentrations with uncertainty bars for a) Mobile Sources, b) Meat Smoke, c) CMB Other, and d) Biomass Burning obtained from three distinct CMB averaging methodologies for the Fresno site. CMB Method 3 results were derived from daily mass apportionments averaged to obtain monthly mass values with uncertainty defined as the standard error of values in the average. CMB Method 1 and CMB Method 2 results were derived from monthly averaged molecular markers, run through the CMB model with uncertainty inputs defined as the standard error and standard deviation of marker data included in the mean, respectively.164