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That article is from April 10.

Since then the severity rating of the Fukushima nuclear crisis has been raised to 7, the highest rating, according to: http://www.bbc.co.uk/news/world-asia-pacific-13045341

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That rise is slightly confusing though: the current situation hasn’t become worse, it’s that the initial situation has been recategorised.

Agreed. For some reason (I believe early news reports explaining the rating) I thought the impact of the disaster was more relevant than the radiation magnitude - i.e. the disaster level was somewhat correlated to casualties and the impact on the environment.

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