“…For example, the alcohol 1-propanol is generally present at lower concentrations than ethanol, and seems to make a much smaller contribution to air quality problems (Hafner et al, 2013), despite a higher reactivity than ethanol (Carter, 2009). However, its concentration varies widely in corn silage, and it may make more of a contribution to poor air quality than ethanol in some cases (Raun and Kristensen, 2010;Hafner et al, 2013Hafner et al, , 2014.…”