In global climate change research, long-term observation of greenhouse gas column abundances and vertical profiles constitutes the primary baseline for verifying emission inventories and evaluating carbon sink capacities. Ground-based FTIR instrumentation utilizes direct solar radiation as an extraterrestrial source to record cross-atmospheric absorption spectra, deducing column-averaged dry-air mole fractions ($\text{XCO}_2$, $\text{XCH}_4$, $\text{XN}_2\text{O}$, and $\text{XCO}$) through forward radiative transfer modeling (RTM). Compared to localized, point-source in-situ samplers, spectral remote sensing samples an integrated atmospheric volume across horizontal scales of several kilometers. This provides enhanced spatial representativeness independent of boundary-layer grid constraints. Established ground-based FTIR monitoring infrastructure (e.g., TCCON) serves as the definitive reference network for spaceborne sensor validation, supplying high-fidelity calibration datasets for GOSAT, OCO-2/3, and TanSat missions. For urban greenhouse gas emission monitoring, portable FTIR solar tracking spectrometers are strategically positioned along cross-tail city gradients—such as upwind backgrounds, industrial fringes, and downwind corridors—to estimate localized emission fluxes via differential absorption spectroscopy. Unlike mobile in-situ laboratory vans, FTIR platforms measure targeted air masses remotely without physical plumes contact, making them uniquely suited for monitoring elevated stationary stacks (smokestacks) or restricted hazardous chemical containment fields. The HG-SR2000 Fourier transform infrared spectroradiometer, developed by Hagorun Technology Limited, utilizes superior spectral resolution and broadband acquisition properties to retrieve multiple atmospheric state parameters, serving as a robust data acquisition platform for academic institutes and environmental monitoring bureaus conducting ground-based remote sensing campaigns. Regarding rapid screening of fugitive VOC emissions across industrial parks, automated scanning FTIR systems execute horizontal or vertical grid sweeps along facility fencelines. This workflow visualizes the spatiotemporal evolution of toxic air plumes—including benzene, toluene, and ethylene matrices—to isolate rogue valves and localized leaks. Compared to traditional gas chromatography-mass spectrometry (GC-MS) workflows that require sequential field canister collection and laboratory analysis, FTIR delivers instantaneous, continuous data streams, providing distinct operational advantages during acute environmental emergencies.

For stationary source emission monitoring, classical compliance protocols rely on structural duct breaching to mount continuous emission monitoring systems (CEMS), introducing deployment risks and restricting mobility. FTIR technology facilitates a passive telemetry mode, utilizing the background sky or low-temperature blackbodies to record the infrared radiance emitted or absorbed by flue-gas plumes, thereby quantifying $\text{SO}_2$, $\text{NO}_x$, $\text{HCl}$, $\text{HF}$, and $\text{CO}$ from safe standoff distances. This configuration circumvents stack-gas contact and enables non-disruptive, unannounced audits without facility shutdown, tailoring it for regulatory compliance enforcement and emergency screening. Coupling these spectral retrievals with atmospheric dispersion models and real-time meteorological feeds quantifies mass emission rates and net fluxes, tracking the downwind mass contribution of individual facilities to regional air basins. During acute environmental incident response (e.g., chemical plant conflagrations, hazardous material spills, transport tanker ruptures), portable FTIR spectroradiometers can be rapidly deployed upwind at safe standoff coordinates. The system continuously tracks downwind hazardous gas distributions, species classifications, concentration peaks, and dispersion vectors, providing real-time criteria to guide incident command decisions regarding evacuation zones, personal protective equipment (PPE) selection, and containment tactics. Compared to electrochemical sensors that demand proximal plume contact and suffer from cross-sensitivity or sensor poisoning, FTIR telemetry features rapid response times (on the order of seconds), concurrent multi-component detection, and long-range non-contact deployment. The HG-SR2000 Fourier transform infrared spectroradiometer by Hagorun Technology Limited features a lightweight, portable structure optimized for rapid field deployment, while its integrated inversion software outputs real-time concentration-time profiles for enhanced operator handling. For odor nuisance tracking around municipal landfills and wastewater treatment plants, FTIR instruments telemetry path-integrated concentrations of ammonia ($\text{NH}_3$), hydrogen sulfide ($\text{H}_2\text{S}$), and complex volatile organic compound matrices. This maps transient odor spikes to specific facility zones or operational hours, providing objective data for resolving community complaints and evaluating the mitigation efficiency of scrubbing infrastructure.

Fourier transform infrared spectroscopy maintains a prominent role in upper-atmospheric research. Ground-based or high-altitude balloon-borne FTIR instruments record solar absorption spectra to retrieve vertical mixing ratio profiles of ozone ($\text{O}_3$), water vapor ($\text{H}_2\text{O}$), and trace gas families from the planetary boundary layer to the stratosphere via optimal estimation methods (OEM). These vertical distribution profiles validate the vertical resolution of spaceborne sounders, calibrate chemical transport models (CTMs), and characterize stratosphere-troposphere exchange (STE) dynamics. In polar research stations, FTIR arrays capture long-term stratospheric ozone layer recovery trends and halogenated ozone-depleting substance (ODS) declines, providing independent empirical validation for the enforcement of the Montreal Protocol. In the validation and truth-testing of satellite atmospheric chemistry products, ground-based FTIR represents the primary reference technique. During orbital overpasses, ground instruments record simultaneous atmospheric columns to assess satellite instrument radiometric calibration stability and flag systematic biases within spaceborne retrieval algorithms. The Atmospheric Infrared Ultra-high-resolution Spectrometer (AIUS) aboard China's GF-5 satellite operates on analogous physical principles, relying heavily on ground-based FTIR validations to establish product accuracy thresholds. Looking forward, with the ongoing optimization of miniaturized, low-overhead FTIR modules, UAV-mounted or tethered balloon-borne FTIR systems will enable high-resolution, vertical profiling of the planetary boundary layer, providing critical data arrays for parsing regional pollution origins and optimizing emission inventory models.

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