If you happen to be in northern China, your new year didn't exactly get off to a grand start -- and pollution is squarely to blame. Smog levels were serious enough that officials took drastic steps to curb emissions, shutting down large swaths of the transportation network. Tianjin, Beijing's major neighboring city, both closed highways and cancelled over 300 flights at its airport. Beijing itself, meanwhile, axed 126 flights and stopped all buses running to nearby cities. The current conditions are expected to last until Thursday, too, so many of these closures could last for a while.