In July/August of 2010 Woodland has been suffering from bad odor, especially on the east side of town by Costco. There was a big stink about it back in 2007 when a odor hotline 530-406-5101 was set up. See this L.A. Times article at http://articles.latimes.com/2007/oct/08/local/me-odor8 for details. A bad smell in the same area was present around 1997 which ended up driving newly constructed home prices down.
Update 7/22/2016: "Burning haybales" were cited today by Yolo County dispatchers as being responsible for eye-stinging smoke hanging in the air throughout Woodland. This was intended to be reassuring.