SO2 concentration measure unit

[robert.sp.86]

Is it normal to show a gas concentration in mg/m²?
Shouldn't it be expressed in mg/m³?
Right now, via app on Android this gas concentration is being expressed in mg/m²

[idefix37]

@robert-sp-86
The mg/m2 unit is correct because Windy shows the amount of SO2 in a column of 1 sq meter section up to the top of atmosphere. With the same amount in 1 cubic meter, you would be dead:
https://community.windy.com/topic/17958/so2-units/4?_=1637304149812

[robert.sp.86]

@idefix37, thanks for clarifying the real meaning of mg/m2 measure unit. Now it has sense for me due to this explanation:

"It is the amount of SO2 in a column from ground to the top of atmosphere expressed per square meter."

Thanks!