Yeah, wood heat is pretty bad for air quality. But I must confess, I burn about a half a cord a year. It was two cords a year before I spend $200 insulating my attic better. One nice thing about wood heat, at least the carbon came out of the atmosphere in your lifetime. So it somewhat breaks even compared to fossil carbon.
The wood is bad, but I figure I earned the rest of my life using a half a cord a year by making my house so much more energy efficient. Basicly, I only light the fireplace on the second sunless day in a row, and generally burn 90% of my firewood during one week when we actually have real winter weather here. The rest of the winter, the house nearly heats itself on the passive solar heating stuff I added to the south side.
Could be worse, 40 miles away in Juarez, they burn anything. Tires are made into sandals, then the tire scrap fires tile kilns. PCB's in the air all winter in El Paso as a result. Anything flamable in the dump heats a shack, like plastic bottles or whatever. Everybody in El Paso just prays for north wind.
Back to wood heat, a lot depends on how your fireplace is set up. A proper woodstove with secondary combustion is legal to use on no burn days. The crappy instant fireplace unit typical in houses should be illegal at all times.
Mine was absolutely horrible. Swear to god using it made the house colder. Several modifications to it helped a lot. Metal door, then strategicly placed vents in the door, plus a combustion air vent next to the hearth made a huge difference. Now it heats great and puts out very little visible smoke. Like the bike, gotta do a few mods to get any performance out of it.
THE LIPO RULES. NEVER ABOVE 4.3V NEVER BELOW 2.7V DON'T PUNCTURE
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.