I have a fantastic book with the great title “Norwegian Wood, chopping, stacking and drying wood the Scandinavian way”! It is highly recommended for anybody with a log burning stove. It goes into great details on emissions. Apparently in 2010 a nationwide campaign was launched in Norway to get people to fire from the top down because it significantly reduces emissions. Basically the logs are put in first and kindling placed on top, the theory being that unburnt pollutants are given off by the wood but there will always be flames higher up to burn them. This has had a significant effect on reducing pollution from wood burners in Norway.
I always use this method and am surprised that hardly any folk over hear have heard of it.