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@frutillaop Hi, thanks for the suggestion, we may consider it in the future. Alerts are available in the free version for you to use.
Yes there no unhealthy level of SO2 in Hawaï right now:
Which means that the SO2 concentration is below 0.10 ppm (part per million)
0.1 ppm is close to 300μg/m3
At 9:00 UTC Windy showed less than 100μg/m3, so this level was unhealthy.
But at 12:00UTC, the figure raised to 400μg/m3
(With modified colors)