Cleveland, W. S. and Devlin, S. J.: Locally Weighted Regression: An Approach to Regression Analysis by Local Fitting, J. Am. Stat. Assoc., 83, 596–610, https://doi.org/10.1080/01621459.1988.10478639, 1988.
De Smedt, I., Pinardi, G., Vigouroux, C., Compernolle, S., Bais, A., Benavent, N., Boersma, F., Chan, K.-L., Donner, S., Eichmann, K.-U., Hedelt, P., Hendrick, F., Irie, H., Kumar, V., Lambert, J.-C., Langerock, B., Lerot, C., Liu, C., Loyola, D., Piters, A., Richter, A., Rivera Cárdenas, C., Romahn, F., Ryan, R. G., Sinha, V., Theys, N., Vlietinck, J., Wagner, T., Wang, T., Yu, H., and Van Roozendael, M.: Comparative assessment of TROPOMI and OMI formaldehyde observations and validation against MAX-DOAS network column measurements, Atmos. Chem. Phys., 21, 12561–12593,https://doi.org/10.5194/acp-21-12561-2021, 2021.
Dobber, M. R., van den Oord, G. H. J., Mälkki, A., Visser, H., de Vries, J., Stammes, P., Lundell, J. O. V., and Saari, H.: Prelaunch characterization of the Ozone Monitoring Instrument (OMI) on board the Earth Observing System Aura satellite, Appl. Opt., 45, 3907–3914, 2006.
Faustini, A., Rapp, R., and Forastiere, F.: Nitrogen dioxide and mortality: review and meta-analysis of long-term studies, Eur. Respir. J., 44, 744–753, https://doi.org/10.1183/09031936.00114713, 2014.
Fu, W., Zhu, L., Kwon, A., Park, R. J., Lee, G. T., Smedt, I. D., Liu, S., Li, X., Chen, Y., Pu, D., Li, J., Zuo, X., Zhang, P., Li, Y., Yan, Z., Zhang, X., Zhang, J., Wu, X., Shen, H., Ye, J., Wang, C., Fu, T.-M., and Yang, X.: Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS-Chem Simulations, Earth and Space Science, 12, e2024EA003894, https://doi.org/10.1029/2024EA003894, 2025.
Gratien, A., Picquet-Varrault, B., Orphal, J., Perraudin, E., Doussin, J.-F. and, Flaud, J.-M.: Laboratory intercomparison of the formaldehyde absorption cross sections in the infrared (1660–1820 cm
−1 and ultraviolet (300–360 nm) spectral regions, J. Geophys. Res., 112, D05305, https://doi.org/10.1029/2006JD007201, 2007.
Herman, J.: OMI Overpass files for NO
2, O
3, HCHO in 7zip format, in: Seasonal Variation of Total Column Formaldehyde, Nitrogen Dioxide, and Ozone Over Various Pandora Spectrometer Sites with a Comparison of OMI and Diurnally Varying DSCOVR-EPIC Satellite Data, Zenodo [data set], https://doi.org/10.5281/zenodo.15468213, 2025.
Herman, J., Cede, A., Spinei, E., Mount, G., Tzortziou, M., and Abuhassan, N.: NO
2 column amounts from ground-based Pandora and MFDOAS spectrometers using the direct-sun DOAS technique: Intercomparisons and application to OMI validation, J. Geophys. Res., 114, D13307, https://doi.org/10.1029/2009JD011848, 2009.
Herman, J., Huang, L., McPeters, R., Ziemke, J., Cede, A., and Blank, K.: Synoptic ozone, cloud reflectivity, and erythemal irradiance from sunrise to sunset for the whole earth as viewed by the DSCOVR spacecraft from the earth–sun Lagrange 1 orbit, Atmos. Meas. Tech., 11, 177–194,https://doi.org/10.5194/amt-11-177-2018, 2018.
Herman, J., Abuhassan, N., Kim, J., Kim, J., Dubey, M., Raponi, M., and Tzortziou, M.: Underestimation of column NO
2 amounts from the OMI satellite compared to diurnally varying ground-based retrievals from multiple PANDORA spectrometer instruments, Atmos. Meas. Tech., 12, 5593–5612,https://doi.org/10.5194/amt-12-5593-2019, 2019.
Judd, L. M., Al-Saadi, J. A., Janz, S. J., Kowalewski, M. G., Pierce, R. B., Szykman, J. J., Valin, L. C., Swap, R., Cede, A., Mueller, M., Tiefengraber, M., Abuhassan, N., and Williams, D.: Evaluating the impact of spatial resolution on tropospheric NO
2 column comparisons within urban areas using high-resolution airborne data, Atmos. Meas. Tech., 12, 6091–6111,https://doi.org/10.5194/amt-12-6091-2019, 2019.
Kim, K.-H., Jahan, S. A., and Lee, J.-T.: Exposure to Formaldehyde and Its Potential Human Health Hazards, J. Environ. Sci. Heal. C, 29, 277–299, https://doi.org/10.1080/10590501.2011.629972, 2011.
Lamsal, L. N., Krotkov, N. A., Celarier, E. A., Swartz, W. H., Pickering, K. E., Bucsela, E. J., Gleason, J. F., Martin, R. V., Philip, S., Irie, H., Cede, A., Herman, J., Weinheimer, A., Szykman, J. J., and Knepp, T. N.: Evaluation of OMI operational standard NO
2 column retrievals using in situ and surface-based NO
2 observations, Atmos. Chem. Phys., 14, 11587–11609,https://doi.org/10.5194/acp-14-11587-2014 , 2014.
Lamsal, L., Duncan, B., Yoshida, Y., Krotkov, N., Pickering, K., Streets, D., and Lu, Z.: U.S. NO
2 trends (2005–2013): EPA Air Quality System (AQS) data versus improved observations from the Ozone Monitoring Instrument (OMI), Atmos. Environ., 110, 130–143, https://doi.org/10.1016/j.atmosenv.2015.03.055, 2015.
Levelt, P. F., Van Den Oord, G. H. J., Dobber, M. R., Malkki, A., Visser, H., De Vries, J., et al.: The ozone monitoring instrument, IEEE Trans. Geosci. Remote Sens., 44, 1093–1101, https://doi.org/10.1109/TGRS.2006.87233, 2006.
Morfopoulos, C., Müller, J.-F., Stavrakou, T., Bauwens, M., De Smedt, I., Friedlingstein, P., Prentice, I. C., and Regnier, P.: Vegetation responses to climate extremes recorded by remotely sensed atmospheric formaldehyde, Glob. Change Biol., 28, 1809–1822, https://doi.org/10.1111/gcb.15880, 2021.
Lorente, A., Folkert Boersma, K., Yu, H., Dörner, S., Hilboll, A., Richter, A., Liu, M., Lamsal, L. N., Barkley, M., De Smedt, I., Van Roozendael, M., Wang, Y., Wagner, T., Beirle, S., Lin, J.-T., Krotkov, N., Stammes, P., Wang, P., Eskes, H. J., and Krol, M.: Structural uncertainty in air mass factor calculation for NO
2 and HCHO satellite retrievals, Atmos. Meas. Tech., 10, 759–782, https://doi.org/10.5194/amt-10-759-2017, 2017.
Newmark, G.: Emissions Inventory Analysis of Mobile Source Air Pollution In Tel Aviv, Israel, Transp. Res. Record, 1750, 40–48, https://doi.org/10.3141/1750-05, 2001.
Nussbaumer, C. M., Crowley, J. N., Schuladen, J., Williams, J., Hafermann, S., Reiffs, A., Axinte, R., Harder, H., Ernest, C., Novelli, A., Sala, K., Martinez, M., Mallik, C., Tomsche, L., Plass-Dülmer, C., Bohn, B., Lelieveld, J., and Fischer, H.: Measurement report: Photochemical production and loss rates o
f formaldehyde and ozone across Europe, Atmos. Chem. Phys., 21, 18413–18432, https://doi.org/10.5194/acp-21-18413-2021, 2021.
Peng, W.-X., Yue, X.-C. , Chen, H.-L., Ma, N.L., Quan, Z., Yu, Q., and Sonne, C.: A review of plants formaldehyde metabolism: Implications for hazardous emissions and phytoremediation, J. Hazard. Mater., 436, 129304, https://doi.org/10.1016/j.jhazmat.2022.129304, 2022.
Pinardi, G., Van Roozendael, M., Hendrick, F., Theys, N., Abuhassan, N., Bais, A., Boersma, F., Cede, A., Chong, J., Donner, S., Drosoglou, T., Dzhola, A., Eskes, H., Frieß, U., Granville, J., Herman, J. R., Holla, R., Hovila, J., Irie, H., Kanaya, Y., Karagkiozidis, D., Kouremeti, N., Lambert, J.-C., Ma, J., Peters, E., Piters, A., Postylyakov, O., Richter, A., Remmers, J., Takashima, H., Tiefengraber, M., Valks, P., Vlemmix, T., Wagner, T., and Wittrock, F.: Validation of tropospheric NO
2 column measurements of GOME-2A and OMI using MAX-DOAS and direct sun network observations, Atmos. Meas. Tech., 13, 6141–6174, https://doi.org/10.5194/amt-13-6141-2020, 2020.
Spinei, E., Whitehill, A., Fried, A., Tiefengraber, M., Knepp, T. N., Herndon, S., Herman, J. R., Müller, M., Abuhassan, N., Cede, A., Richter, D., Walega, J., Crawford, J., Szykman, J., Valin, L., Williams, D. J., Long, R., Swap, R. J., Lee, Y., Nowak, N., and Poche, B.: The first evaluation of formaldehyde column observations by improved Pandora spectrometers during the KORUS-AQ field study, Atmos. Meas. Tech., 11, 4943–4961, https://doi.org/10.5194/amt-11-4943-2018, 2018.
Spinei, E., Tiefengraber, M., Müller, M., Gebetsberger, M., Cede, A., Valin, L., Szykman, J., Whitehill, A., Kotsakis, A., Santos, F., Abbuhasan, N., Zhao, X., Fioletov, V., Lee, S. C., and Swap, R.: Effect of polyoxymethylene (POM-H Delrin) off-gassing within the Pandora head sensor on direct-sun and multi-axis formaldehyde column measurements in 2016–2019, Atmos. Meas. Tech., 14, 647–663, https://doi.org/10.5194/amt-14-647-2021, 2021.
Stavrakou, T., Müller, J.-F., Bauwens, M., Boersma, K. F., and van Geffen, J.: Satellite evidence for changes in the NO
2 weekly cycle over large cities, Sci. Rep., 10, 10066, https://doi.org/10.1038/s41598-020-66891-0, 2020.
Tzortziou, M., Herman, J. R., Cede, A., Loughner, C. P., Abuhassan, N., and Naik, S.: Spatial and temporal variability of ozone and nitrogen dioxide over a major urban estuarine ecosystem, J. Atmos. Chem., 72, 287–309, https://doi.org/10.1007/s10874-013-9255-8, 2015.
Van der A, R. J., Eskes, H. J., Boersma, K. F., van Noije, T. P. C., Van Roozendael, M., De Smedt, I., Peters, D. H. M. U., and Meijer, E. W.: Trends, seasonal variability and dominant NO
x source derived from a ten year record of NO
2 measured from space, J. Geophys. Res., 113, D04302, https://doi.org/10.1029/2007JD009021, 2008.
Wang, P., Holloway, T., Bindl, M., Harkey, M., and De Smedt, I.: Ambient Formaldehyde over the United States from Ground-Based (AQS) and Satellite (OMI) Observations, Remote Sens., 14, 2191, https://doi.org/10.3390/rs14092191, 2022.
Wittrock, F., Richter, A., Oetjen, H., Burrows, J. P., Kanakidou, M., Myriokefalitakis, S., Volkamer, R., Beirle, S., Platt, U., and Wagner, T.: Simultaneous global observations of glyoxal and formaldehyde from space, Geophys. Res. Lett., 33, L16804, https://doi.org/10.1029/2006GL026310, 2006.
Zhao, X., Griffin, D., Fioletov, V., McLinden, C., Davies, J., Ogyu, A., Lee, S. C., Lupu, A., Moran, M. D., Cede, A., Tiefengraber, M., and Müller, M.: Retrieval of total column and surface NO
2 from Pandora zenith-sky measurements, Atmos. Chem. Phys., 19, 10619–10642, https://doi.org/10.5194/acp-19-10619-2019, 2019.
Zhang, Y., Li, R., Min, Q., Bo, H., Fu, Y., Wang, Y., and Gao, Z.: The controlling factors of atmospheric formaldehyde (HCHO) in Amazon as seen from satellite, Earth and Space Science, 6, 959–971, https://doi.org/10.1029/2019EA000627, 2019.
