In this study, an optical telemetry method based on airborne and vehicular passive differential optical absorption spectroscopy (DOAS) technology to measure the emission flux of atmospheric pollution gas is studied. This method use an airborne imaging spectrometer and vehicular DOAS spectrometer to synchronously observe navigation within an industrial area. The distribution and diffusion trend of NO₂ vertical column concentration in this region are detected through spectral inversion. By utilizing the real-time wind field data and attenuation model of NO_x in the atmosphere, the NO_x attenuation and the proportion of each component of nitrogen oxides are derived, and thus the emission flux of pollution source NO_x is obtained. The NO_x attenuation in the atmosphere is corrected by using the proposed method. The NO_x emission fluxes of the power and steel plant in the industrial park are calculated to be 3.3331×10 ²⁴ molecule·s ^-1 and 2.6138×10 ²⁴ molecule·s ^-1, respectively. The results show a consistency in airborne and vehicular observations. Compared with the emission flux computed by the uncorrected NO_x attenuation, the emission flux accuracy of proposed method has significantly improved by 5%--20%. Compared with the vehicle or airborne independent observation method, proposed method combine the advantages of large scanning range for airborne detection and high spectral resolution for vehicle detection, which is conducive in tracking pollution diffusion and can improve the detection accuracy.