@robertbuk
You are talking about SO2 amount per cubic meter. This is how this gas content is expressed at ground level.
What Windy shows is totally different. It is the amount of SO2 in a column from ground to the top of atmosphere expressed per square meter.
Click the small circled i in bottom right of your screen to get information about this layer.
https://community.windy.com/topic/13315/probably-wrong-units-of-so2-concentration?_=1618411932003

This SO2 layer shows the plume of the volcano in altitude, not the SO2 content at ground level which is given by the Air quality stations in Windy. For example:

714545E3-B683-45E7-8D9A-AD32C6D0303D.jpeg

At this Air quality station with a 89 quality index, the SO2 content is 11μg/m3 at station level while in the total height of the atmosphere the value is 209.35mg/m2.

@korina
Probably a typo km/m2 >>kg/m2

We can see the anomaly in SO2 actual from the NASA data itself: https://so2.gsfc.nasa.gov/pix/special/time_sres/time_series.html

This clearly shows some crazy spikes right then and there for Eastern Asia. Look at the scale, ffs, its off the charts:

https://so2.gsfc.nasa.gov/pix/special/time_sres/china_so2pca_pbl_ts_plot.png

And there's also a weird data hole around Feb 2 (0 everywhere).

Doesn't mean we know what it was from, but it cannot be denied that there are/were crazy spikes in SO2 over that region recently.

@Naiyana4
Yes there no unhealthy level of SO2 in Hawaï right now:
https://www.hawaiiso2network.com/

Which means that the SO2 concentration is below 0.10 ppm (part per million)

284EDB1C-FCBE-4B39-8214-8C3A3AE5D92B.jpeg

0.1 ppm is close to 300μg/m3

E14253B8-1BB1-4F03-9E0B-97C3FDF8902E.jpeg

At 9:00 UTC Windy showed less than 100μg/m3, so this level was unhealthy.

E86BC3B8-FE74-431F-80AA-18E47D76E6EC.jpeg

But at 12:00UTC, the figure raised to 400μg/m3
(With modified colors)

4CFC0A87-3CB1-47E3-9FF8-3D31DF6541D8.jpeg

Quite strange