Cbana Labs has developed Micro-Gas Chromatograph (Micro-GC) columns featuring a variety of coatings and operating with carrier gases including helium, hydrogen, and air. A conventional GC column typically employs smaller-species gases such as helium and hydrogen for the carrier gas. Air can be used in a GC, but the separations are typically poor because the diffusivity of most analytes in air is smaller than the diffusivity in the lighter carrier gases. One can reduce the effects of the diffusivity by decreasing the diameter of the column, but this leads to a higher pressure drop. Cbana Labs has been able to avoid these difficulties by using microfabrication to create GC columns with rectangular cross sections and high aspect ratios. By doing so, the GC columns have shorter diffusion paths so that a number of gases can be used effectively as the carrier gas (such as Ne, Ar, and N2), while maintaining a reasonable pressure drop. We also demonstrated Cbana Labs coating of the stationary phase showed no degradation for more than 10,000 times of sample injection.