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Toronto Pandora HCHO data

Explore daily HCHO (formaldehyde) measurements from five Toronto sites on this interactive plot. Use the legend to toggle sites, and tools to adjust the view. The plot updates automatically each day and may take a moment to load.

Toronto area HCHO (formaldehyde) data from the Pandora instruments:

Note: no ECCC Downsview data passed the quality control filter in 2024-2025, so this recent data plot may not show any points for that site. However, the longer time series of data can be seen at:

https://tame-bokeh.physics.utoronto.ca/pandora_GTA_HCHO

For a deeper look at how HCHO is analyzed using Pandora ground-based measurements, see: 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.