We report the levels of airborne individual PCB concentrations of gas (XAD-2) phases from the City of Chicago in 2009. Twenty-seven locations were sampled for gas phases, where 141 gas phases were collected. One hundred and seventy-one individual or coeluting congener PCBs are reported. Final individual PCB congener concentrations, as well as ambient air temperature (K), and wind speed (m/s) are included.

• Individual PCB congener concentration in gas-phase using high-volume air sampler (i.e., HiVol XAD-2) Quantification and determination of individual PCB congeners using GC-MS/MS Values = 0 indicates non-detected Concentration was calculated using the mass of the congener divided by both deployment time and sampling flow (0.4 m3/min) No blank correction was performed