These devices, when deployed across a large population, collectively measure the air quality of a community or a
large area. Similarly, one can utilize microphones on mobile phones to monitor noise levels in communities. Another example is CreekWatch developed by IBM Almaden Research Center. It monitors water levels and quality in creeks by aggregating reports from individuals, such as pictures taken at various locations along the creek or text messages about the amount of trash. Such information can be used by water control boards to track pollution levels in water resources