Wintertime air pollution — fueled by wood- and coal-burning stoves — has reached such an unhealthy level in Fairbanks, Alaska, that officials say a crackdown is needed. Fairbanks Mayor Jim Whitaker told Christopher Eshelman of the Fairbanks News-Miner that particulate pollution is definitely unhealthy: “That science is intact, it’s legitimate. So now the simple question is about alleviating the problem.” Borough officials are wrestling with whether the state or the borough should enforce air-pollution regulations.