1 Substance abuse. Abuse of drugs and alcohol can contribute to panic disorder.  Major life stress. Stressful events and major life transitions, such as the death of a loved one, can sometimes trigger panic attacks, which can potentially recur and go on to become panic disorder.
Zero emission refers to an engine, motor, process, or other energy source, that emits no waste products that pollutes the environment or disrupts the climate. Contents.
(Dec 2016) Thirteen statesâmostly in the Northeast and Northwestâand the District of Columbia have adopted California's stricter emissions standards, many of which also participate in the zero-emission vehicle mandate.