Radiation

Scandinavian states have reported elevated, but not dangerous, radiation levels in the atmosphere.

The International Commission on Non-Ionizing Radiation Protection introduces "more conservative limits".

A selection of the best science and environment features published this year.

The radiation spike, caused by a rocket blast in the Arctic, lasted for several hours, Russia says.

People rush to buy iodine pills after a rocket engine explosion and radiation spike at a military site.

The explosion on a naval test range in Arkhangelsk region kills two people and injures six.