None of the reactors pose a threat to public health, said Nuclear Regulatory Commission spokeswoman Diane Screnci.

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In addition to animal welfare concerns, opponents have said slaughtering horses for human consumption could pose a threat to human health and safety.

NPR: Okla. Governor Signs Horse Slaughter Legislation

On Dec. 7 2009, as expectations grew for the Copenhagen Climate Change Conference, Jackson signed an endangerment finding that asserted carbon dioxide and five other greenhouse gases pose a threat to human health when concentrated in the atmosphere.

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Officials said the discharged water would not pose a significant threat to human health, but local fishermen have reacted angrily.

BBC: Japan quake: Nitrogen pumped into nuclear reactor

AIDS, they have either become established only in restricted areas or are biologically limited in their ability to pose a threat to international public health.

ECONOMIST: Some early lessons and legacies of SARS

The EPA maximum contaminant level is 3.0, but this is a conservative standard designed to minimize exposure over a lifetime, so EPA does not consider these levels to pose a health threat.

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