Source‐Receptor Analysis of Volatile Hydrocarbons

A chemical mass balance receptor model for total nonmethane hydrocarbon concentration was developed based on ambient measurements of 24 volatile hydrocarbons collected at two sites in New Jersey. The model was used to quantify the contributions from petroleum refineries, gasoline vapors, vehicle exhaust, paint solvents and petrochemical industries to ambient non‐methane hydrocarbon concentration. Source profiles (mass fractions of the individual 24 hydrocarbons in the emissions from each modeled source category) were developed from published data. For the 8 AM samples collected at Linden, N.J., the average contributions to ambient non‐methane hydrocarbon concentration (defined as the sum of the 24 individual hydrocarbons) were $92\mu g/m^3$ from refineries, $83\mu g/m^3$ from gasoline vapor, $29\mu g/m^3$ from petrochemical industries, $49\mu g/m^3$ from vehicle exhaust, $26\mu g/m^3$ from paint solvents and $77\mu g/m^3$ from sources not directly considered by the model. For the early morning samples evaluated for this study, hydrocarbon reactivity does not have a significant effect on the chemical mass balance predictions.