A composite image of the SMC N33 region obtained with Spitzer IRAC data. The object at the center is the H ii region N33. The two other bright sources are stars #4 and #6 (see Fig. 2). The 4.5 μm band is represented in blue, the 5.8 μm band in yellow, and the 8.0 μm band in red. The compact H ii region N33 is the red nebular object at center. Note the diffuse emission curl over the main body of the H ii region running from north (inside the upper circle) to south-east. The circles enclose the young stellar object (YSO) candidates S3MC_J004930.12−732623.42 and S3MC_J004929.07−732658.56 reported by Bolatto et al. (2007). However, the true nature of these objects and their relation with N33 are not clear; see the text (Sect. 4). Field size 280′′  ×  160′′ (~83  ×  47 pc). North is up and east to the left.