I got inspired by the Show HN post about 41 years of sea surface temperature anomalies[0] and made a similar visualization showing global tropospheric nitrogen dioxide (NO₂) density over time, measured by Sentinel-5P TROPOMI.
[0]https://news.ycombinator.com/item?id=47702791
Show HN: 7 Years of Tropospheric NO₂
no2.libmap.org