PARIS-IR (the Portable Atmospheric Research Interferometric Spectrometer for the Infred) is a solar absorption Fourier Transform Spectrometer (FTS). The recorded spectra from this FTS provide information about several trace gases in the atmosphere such as O 3 , HCl, HNO 3 , HF, CO, N 2 O, CH 4 , and C 2 H 6 . The instrument has a spectral coverage between 750 and 4,400 cm −1 at a resolution of 0.02 cm −1 at a maximum optical path difference (MOPD) of ±25 cm. Since the instrument is portable, measurement sites include Eureka, Nunavut (2004-2013), Halifax, Nova Scotia (2010 and 2011), and Toronto, Ontario (2009 and 2011). Future measurement sites will include a balloon gondola, which will be launched in 2014 from Timmins, Ontario. In this talk, I will discuss the PARIS-IR instrumentation and the measurements of tropospheric and stratospheric trace gases. More specifically, I will focus on my resent studies of the polar stratosphere during the Arctic sunrise period using PARIS-IR spectra.