Please can someone help? I want to subscript the '2' in 'NO2' in the main heading and the xlabel, and I want to add '(µg/m3)' (with a superscript '3') in the xlabel, but the way I did it before for histograms doesn't work. Any help would be gratefully received!
This is what I have so far:

          main = "Density plot of background NO2 concentrations",
          xlab = "NO2")

Try the new ggtext package.

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