Formaldehyde Trends in Isfahan from Sentinel-۵P (۲۰۱۹-۲۰۲۵)

Conducting regular monitoring of atmospheric formaldehyde (HCHO) is imperative for comprehending the current state of air quality, evaluating the emissions of volatile organic compounds (VOCs), and assessing the extent of photochemical activity within a region. This study analyzes the spatial and temporal variability of tropospheric HCHO concentrations over Isfahan Province from ۲۰۱۹ to ۲۰۲۵ using Sentinel-۵P/TROPOMI satellite observations processed through Google Earth Engine (GEE). Spatial mapping revealed distinct concentration gradients, with higher HCHO levels primarily located in the northern and central regions. These higher levels are influenced by urban density, industrial activities, and VOC emitting sources. Temporal analysis revealed pronounced seasonal patterns, with elevated concentrations observed in late spring and summer, attributable to augmented photochemical reactions, and diminished levels during winter months. Interannual variations further indicated shifts in emission intensity and atmospheric conditions across the study period. This research demonstrates the effectiveness of remote sensing for large-scale atmospheric pollutant monitoring by integrating multi-year satellite data with cloud-based geospatial analytics. The findings offer significant insights for air-quality management, identifying key spatial hotspots and seasonal peaks that are pertinent to environmental policy and pollution-mitigation strategies.

کلیدواژه ها:

Formaldehyde ، Sentinel-۵p ، Google earth engine ، Isfahan