The state-of-the-art method to generate bright and broadband THz radiation is utilizing high-power femtosecond laser to ionize ambient air into plasma. The transient electric dipole with a lifetime of sub-100 fs will, in turn, emit THz waves that covers an broad spectral range. We will implement experimental setup for coherent generation and detection of THz waves from a two-color femtosecond laser-induced air plasma. To explore and ultimately unveil the coherent nature of radiation process on ultrafast timescale from the atomic level through macroscopic spatial scale.