Clouds settle low in the sky as dusk sets in across Pajaro Valley. Fields of strawberries stretch out as far as the eye can see, catching the last amber rays of the day. In the distance, the twin stacks of Moss Landing Power Plant sit among factories pushing plumes of smoke into the air. On the exterior wall of a house in Castroville, a newly installed sensor glows green with an important message: It's safe to go outside.