Re: Comment to "Marcon, A., Panunzi, S., Stafoggia, M. et al. Spatial variability of nitrogen dioxide and formaldehyde and residential exposure of children in the industrial area of Viadana, Northern Italy." Environ Sci Pollut Res 28, 28,096–28,106 (2021). (10.1007/s11356-020–12015-0)

The colourimetric coding of Figures a and b are suggestive, for readers, of the same levels of formaldehyde concentrations measured in the two measurement campaigns, while in reality, in 2010, the represented high value of the average annual concentration was 3.20 µg/m SP 3 sp and in 2017-2018 of 1.85 µg/m SP 3 sp . Looking at these parameters: As emerges from the seasonal trend of the concentration values measured in summer and winter in 2017-2018 (Table 2), concentrations of NO SB 2 sb and formaldehyde in winter are about double than those in summer; Simply by observing Figs. Spatial variability of nitrogen dioxide and formaldehyde and residential exposure of children in the industrial area of Viadana, Northern Italy.". [Extracted from the article]