Fig. 1: Global distribution of yearly averaged column densities from OMI for formaldehyde (HCHO), nitrogen dioxide (NO2), and the HCHO/NO2 ratios (FNR). | Nature Communications

Fig. 1: Global distribution of yearly averaged column densities from OMI for formaldehyde (HCHO), nitrogen dioxide (NO2), and the HCHO/NO2 ratios (FNR).

From: Ozone trends and their sensitivity in global megacities under the warming climate

Fig. 1

The maps show data in 2005 (a–c), 2012 (d–f), and 2019 (g–i) at a spatial resolution of 0.25° × 0.25°. Masks (white areas) for land–ocean, HCHO values below 7 × 1015 mol cm–2, NO2 values below 1 × 1015 mol cm–2, and FNR values above 6 were applied to facilitate data visualisation. Units for HCHO and NO2 are ×1015 mol cm−2, and FNR is dimensionless. Thin black lines represent country boundaries or shorelines.

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