Acidic Rain in April???

I've received an email today from a friend about Acidic Rain in April (below)...
So, I do a search on internet to see whether it's true or not...

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從今天到28號，請大家不要淋到雨。750年一次的酸雨，被淋到后患皮膚癌的幾率很高。因為歐洲的一個火山的大爆發，向高空噴發了大量硫化物，在大氣層7000~10000米的高空形成了濃厚的火山灰層，強酸性。請大家注意，把這個信息轉發給你身邊的人

From today to the end of April, try not to be caught in the rain. The volcanic eruption in Iceland has created a massive amount of sulphur in the atmosphere, resulting in strongly acidic rain. There are much higher risks of skin cancer if one is soaked in such acidic rain (which happens once in 750 years).
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Apparently, multiple versions of similar threats have been floating around internet...
One version is like this:
“Be careful from the 20th to 28th of this month, there is possibility of an ACID Rain. The dark circle appeared around the moon on 17th of the last month and this is an indication of ACID Rain. Apparently this happened once in 750 years ago. It rains normally but it may cause skin cancer if you expose yourself to it. so ALERT you dear ones this information is from NASA in the USA. Do not neglect”

Other versions are similar but with different rain dates and causes...
The common thing is that all say it happened 750 years ago and all are related to ACID Rain...


DO NOT BELIEVE IT!

I haven't found an article that clears the Iceland ashes version, but I've found that NASA Meteorologist already cleared the dark circle version.  Go here: 
http://thewillnigeria.com/world/3976-NASA-Meteorologist-Clears-The-Air-Acid-Rain-Fears.html