*p-*cymene were computed using canonical variational transition state theory (CVT) with small-curvature tunneling (SCT) between 200 and 400 K. The geometries and frequencies of all the stationary points are calculated at the M06-2X/6-31+G(d,p) and MPWB1K/6-31+G(d,p) levels of theory. The rate coefficients obtained over the temperature range of 200–400 K using M06-2X/6-31+G(d,p) theory were used to derive the Arrhenius expression:

*k*(T) = 3.21 × 10

^{−21}T

^{3.18}exp[1051/T] cm

^{3}molecule

^{−1}s

^{−1}. The tropospheric lifetime and ozone production potential of

*p-*cymene were computed to be 1.4 days and 1.6 ppm, respectively.