Weather conditions play a part in how much ozone is produced and where it has high ground-level impacts. Ozone is usually produced on warm, sunny, non-breezy days. Ozone levels are also dependent on the wind to blow VOCs, NOX, or already created ozone into an area. This phenomenon is known as "transport". In Michigan, transport of ozone is most visible on the Lake Michigan side of the state. Recent air quality studies have shown that ozone produced over Lake Michigan from VOC and NOX emissions at upwind states is transported into the shoreline of West Michigan.