The eXtension Livestock and Poultry Environmental Learning Center offers two new publications focusing on air quality. Download “Biofilters for Odor and Air Pollution Mitigation in Animal Agriculture” at http://www.extension.org/sites/default/files/BiofiltersforOdor%20FINAL.pdf. A recent North Carolina State University publication provides an update on manure additive options. Download a PDF of “Additives for Improving Hog Farm Air Quality” at http://www.extension.org/sites/default/files/HogAir%20additives%20FINAL.pdf.