What does it mean when a car fails remote sensing monitoring?

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Remote sensing monitoring of a car failing means that the vehicle's exhaust emissions did not meet the standards during remote sensing detection, and it needs to be retested at another remote sensing point. Below is relevant information about automotive exhaust remote sensing detection: Specific meaning: Exhaust remote sensing detection vehicles utilize advanced technologies such as tunable infrared laser diode differential absorption spectroscopy, ultraviolet differential absorption spectroscopy, weak signal detection technology, and image recognition technology. By leveraging the fact that different pollutants absorb light waves of varying frequencies differently, the absorption spectrum can serve as a 'fingerprint' to identify different gas molecules, determining their composition and concentration based on the position and intensity of the absorption lines. Working principle: The measurement of CO and CO2 in vehicle exhaust employs near-infrared laser diode absorption spectroscopy technology, while the measurement of NO and HC uses ultraviolet differential absorption spectroscopy technology with a deuterium lamp as the light source. This enables automatic remote sensing of multiple pollutants in vehicle exhaust emissions during actual driving, including CO, CO2, NO, HC, and exhaust smoke density, with real-time output of monitoring results. Combined with vehicle identification technology, measures can be taken against vehicles exceeding emission standards to improve air quality.