There are times when actual or predicted stormy weather will close DEP offices and preclude EMS staff from observing scheduled stack tests. In some instances, you may feel that your test can still take place safely despite the weather. The decision on whether a scheduled stack test can commence unobserved is made on a case-by-case basis. When one of these storm closings occurs, if not already contacted by EMS, contact the EMS observer assigned to your test on their State cell phone ( https://www.nj.gov/dep/bts/contact.html ) to determine if your test can proceed, or whether you will need to reschedule. In most of these storm closing instances, it is our expectation that testing will be canceled based on safety concerns and/or the impact on data quality.