the cyclone's path. Extreme wind warning (EWW) – An extreme wind event producing sustained surface winds of or greater, associated with the eyewall of a major hurricane (Category 3 or higher on the Saffir-Simpson Scale), non-convective winds, downslope winds or a derecho is occurring or expected to occur in the specified coastal or inland area within one hour. Extreme Wind Warnings—which should be issued no prior than two hours before the onset of extreme winds—are not issued by WFOs located within the Pacific basin. Other hazards Air quality alert (AQA) – Significant atmospheric pollution (through inhalable particulates or ozone) is expected to accumulate in a given area, and may be hazardous to people suffering from respiratory conditions. Criteria developed in conjunction with the local or state EPA and the product issued at their request. Air stagnation advisory (NPW) – Atmospheric conditions stable enough to cause air pollutants to accumulate in a given area. Criteria are developed in conjunction with the local or state EPA and the product is issued at their request. Ashfall advisory (NPW) – Ash rain resulting in deposition of less than of ashfall accumulation at the surface is occurring or likely. Ashfall from the large airborne ash plume may originate directly from a volcanic eruption, from the re-suspension (by wind) of a significant amount of relic ash, or by large fires. Ashfall accumulations may affect the health of people suffering from respiratory illnesses. Ashfall warning (NPW) – A volcano undergoing a major eruption is creating the likelihood of significant impact on the public (with higher risk to the health of people with respiratory illnesses) and maritime activity due to ashfall accumulation forecast to be greater than or equal to , significant debris, lava, or lahar flows. Blowing dust advisory (NPW) – Considerable blowing sand or dust are expected to reduce visibilities to between or less, but greater than over a widespread or localized area, caused by strong sustained winds of or greater. Blowing dust warning (NPW) – Life-threatening dust will reduce visibilities to near zero over a widespread or localized area, caused by strong sustained winds of or greater. Civil emergency message (CEM) – A message intended to warn the public of an in-progress or imminent significant threat(s) to public safety and/or property. Although the hazard that warrants such a message to be issued is less specific than that meriting a Civil Danger Warning, it is given