On page 6 of the originally published version of the article the value of the charcoal component in the described briquettes was incorrectly reported as 20%. The correct value is 80%.
The sentence in the originally published version of the article was as follows:
A briquette made from 20% charcoal dust and 20% soil produces three times and nine times fewer carbon monoxide and fine particulate matter emissions than wood charcoal, respectively, and burns for one and half times longer (Njenga et al. 2013a, 2013b).
The sentence has been corrected as follows:
A briquette made from 80% charcoal dust and 20% soil produces three times and nine times fewer carbon monoxide and fine particulate matter emissions than wood charcoal, respectively, and burns for one and half times longer (Njenga et al. 2013a, 2013b).
The publisher apologizes for the error.
In addition, the following text has been added to the end of the Acknowledgements section:
They also appreciate the travel and staff time support provided to Dr. Mary Njenga by the CGIAR Research Program on Water, Land and Ecosystems.
The article has been corrected accordingly.