Forced air is the key to these new pellet boilers and the pellets themselves can be dry and the smaller size and composition of loosely glued sawdust is a factor too. The fire has an oxygen sensor and a mini computer as well. The glue may be a catalyst. What is the big deal? The cost of heating is one half the cost of oil. Still don't like em. They are the best but still are 5 times as polluting as oil! Wish we had gas here in Maine. Personally, I like free energy. Free energy is pouring through windows just waiting to be tapped with Jeffersonian indoor shutters or shades or popout insulating panels made of bubble plastic or cheap low E plastic films made by people themselves to avoid the high cost of windows. It's God's gift to us. The Romans tapped it and it is the reason why east west roads are best and why they used them. They also put houses next to one another to save energy. Beware woodburner, God is watching you. You reap what you sow and you are creating a hell on Earth. Guess where you are going? God will throw more than one log on for you.
Sweden has also developed small electrostatic precipitators and the Energy Dept. has written that air toxics can be reduced with gravel beds. If activated carbon blocks don't burn up in hot exhaust gases they would be best. If they can't be used then perhaps activated carbon injection systems could be used. I had to ask the IQ air company to combine their nano filter with activated charcoal for toxic gases to protect my asthmatic daughter and they did it. Why don't all you woodboiler designers get serious about reducing pollution at the source and why don't all you legislators pass laws requiring them to do it? It can be done. The answer of course is money. It is always money vs. health. Greed vs. purity. Good vs evil. God vs the devil.