The Donora smog, an air inversion resulting in a wall of smog, killed 20 people and sickened 7,000 more in Donora, Pennsylvania, in the United States. It was a major air pollution incident in the US and was due to a combination of a specific weather pattern and pollution from industrial activity [1]
The takahe, a flightless bird indigenous to New Zealand, is rediscovered in a mountainous area of Fiordland. The population and range of the bird had been severely reduced following the human settlement of New Zealand.