I think the rule of thumb is that if the smell is "awfull" then (simple) 
precautions should be taken.  When in Hawaii, I remeber that a day of 
VOG would give me sensation in my chest - presumably lungs.  You could 
usually see it too as a very slight haze, hence the name VOG - volcanic fog.

Cheers

Ian

Jón Frímann wrote:

>Hi
>
>I don't think that this sulphur dioxide is at dangerus levels, the
>source is ~150km away from my location. But the smell is awful. The wind
>is strong at my location, it is expected to stay strong today.
>
>Regards.
>  
>
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