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We examine polycyclic aromatic hydrocarbon (PAH), dust and atomic/molecularemission toward the Galactic bulge using Spitzer Space Telescope observationsof four fields: C32, C35, OGLE and NGC 6522. These fields are approximatelycentered on (l, b) = (0.0{\deg}, 1.0{\deg}), (0.0{\deg}, -1.0{\deg}),(0.4{\deg}, -2.1{\deg}) and (1.0{\deg}, -3.8{\deg}), respectively. Far-infraredphotometric observations complement the Spitzer/IRS spectroscopic data and areused to construct spectral energy distributions. We find that the dust and PAHemission are exceptionally similar between C32 and C35 overall, in partexplained due to their locations---they reside on or near boundaries of a 7Myr-old Galactic outflow event and are partly shock-heated. Within the C32 andC35 fields, we identify a region of elevated H{\alpha} emission that iscoincident with elevated fine-structure and [O IV] line emission and weak PAHfeature strengths. We are likely tracing a transition zone of the outflow intothe nascent environment. PAH abundances in these fields are slightly depressedrelative to typical ISM values. In the OGLE and NGC 6522 fields, we observeweak features on a continuum dominated by zodiacal dust. SED fitting indicatesthat thermal dust grains in C32 and C35 have comparable temperatures to thoseof diffuse, high-latitude cirrus clouds. Little variability is detected in thePAH properties between C32 and C35, indicating that a stable population of PAHsdominates the overall spectral appearance. In fact, their PAH features areexceptionally similar to that of the M82 superwind, emphasizing that we areprobing a local Galactic wind environment.

Polycyclic aromatic hydrocarbon emission toward the Galactic bulge