Comparison of TROPOMI NO₂, CO, HCHO, and SO₂ data against ground‐level measurements in close proximity to large anthropogenic emission sources in the example of Ukraine

Abstract

The TROPOspheric Monitoring Instrument (TROPOMI) significantly improved the quality of air pollution monitoring. The comparison against other data sources showed acceptable results and good correlation. However, highly polluted areas remain the reason for large uncertainties. In our study, we compared TROPOMI NO 2 , CO, HCHO, and SO 2 data against ground-level measurements from Ukrainian monitoring sites, which could be considered rather unusual due to their close location to large anthropogenic emission sources. These sites were established in the former USSR to reflect the maximal air pollution levels. TROPOMI detected all cities with huge anthropogenic emissions in 2019-2020 and qualitatively reflected air pollution in Ukraine. However, direct comparison against individual monitoring sites showed mainly insignificant correlation, which was not much improved with cloudiness filtering, spatial averaging, and considering boundary layer height. We show that on an hour-to-daily scale, differences appear when remote sensing at a particular time cannot catch the elevated pollution levels in the boundary layer after air mass transportation. On a seasonal scale, the correlation decreases because of the differences in seasonality between near-surface and column pollutants' content. We discuss that the relationship between TROPOMI and ground-level measurements depends on the season, the continuance of industrial emissions, and the features of individual emission sources.

Application of a Quality-Specific Environmental Risk Index for the Location of Hives in Areas with Different Pollution Impacts

“…The mission consists of one satellite carrying the TROPOspheric Monitoring Instrument (TROPOMI); this space-borne, nadir-viewing imaging spectrometer covers wavelength bands between ultraviolet and shortwave infrared and can detect daily concentrations of formaldehyde (CH 2 O), carbon monoxide (CO), nitrogen dioxide (NO 2 ) and sulphur dioxide (SO 2 ) in the tropospheric column (https://s5phub.copernicus.eu/dhus/#/home, accessed on 12 October 2022). To-day, few studies use TROPOMI in order to acquire information on air pollutants by using different bands of the on-board spectrometer [34,35]. To download the images and reduce the calculated values, a script was created by means of the Google Earth engine to elaborate all the images from the year 2021 and aggregate these by means of a value-reducer function in order to obtain minimum, median and maximum values at the 95th percentile (https://earthengine.google.com/, accessed on 12 October 2022); this approach yields a single image for each band of air pollutants, which represents the ratio between the moles of substance analyzed and the moles of air (Table 5).…”

Status of atmospheric air pollution in Ukraine prior to the full-scale russian invasion. Part 1: ground-level content of pollutants

“…почали активно розвиватися різноманітні напрямки досліджень актуального стану забруднення як для всієї території України [16,17], так і для окремих регіонів та міст [18][19][20]. У останнє десятиріччя до аналізу стали активно залучатися новітні методи досліджень із залученням супутникового зондування, сучасних математичних моделей, та методів вимірювань [21][22][23][24] The paper is dedicated to examination of atmospheric air pollution in Ukraine that is aimed at establishing basic air quality conditions prior to the full-scale Russian invasion. Analyses cover five air pollutants (dust, sulfur dioxide (SO 2 ), carbon monoxide (CO), nitrogen dioxide (NO 2 ), and formaldehyde (CH 2 O)) across 126 monitoring stations in 39 cities.…”

Інтегрований Погляд На Сучасний Стан Забруднення Атмосферного Повітря В Україні

“…Водночас недостатньо вивченими залишалися можливості супутникового зондування місць із локальними максимумами забруднення в межах міст. Ці можливості вдалося реалізувати на основі даних наземних спостережень в Україні[1], де пости моніторингу розміщено за радянськими підходами до фіксації забруднення для виявлення негативної дії промислових підприємств.…”