French gas cloud: harmless here, but how about mid-Channel?

[Greenheart]

Sorry if this question has been already asked and answered hereabouts...I looked but didn't see it.

An enormous gas-cloud appears to have escaped from a factory or processing plant in northern France in the last 24 hours...it blew across the Channel, and stank up large parts of the Kent and Sussex coast.

Apparently the gas had by then dispersed to just a few particles per billion in the atmosphere, but plenty of people here complained of its horrendous stink...

...what I'm wondering, is how asphixiating or stomach-turning the miasma might have been, if it was encountered very much nearer to its origin? For instance, aboard a yacht just off the French coast?

 

[robmcg]

Is this the return of the 'Euro-niff' from a few years back?

 

[VicS]

Its a release of the stenching agent added to lpg I believe. Ethyl mercaptan? ( aka ethanethiol) which has threshold of smell of less than 1 part per billion.

The long term, 8hr, workplace exposure limit is 0.5 parts per million and the 4 hr limit 2 ppm

Google will find you some data on toxicity

I thought it was the next door neighbours cooking ... garlic with everything.... again!