Sorry, but even with a "supposed" adjective in the title, this category is totally out of the scope of Commons. How are we to recognise a supposed chemtrail? Supposed by whom, with what kind of evidence? These are just contrails. Commons is not the place to have people build up their conspiracy theories. Ariadacapo (talk) 21:35, 17 November 2018 (UTC)[reply]
I (as creator of the category) understand you totally. So, my intention is to collect - or better said - to separate images with ordinary (in common sense of a meaning) contrails, which usually last for about 20 seconds or something, and extraordinary contrails, which last for hours and which in some way essentially differ from ordinary ones. Maybe it's just the name of the category that should be more adequate, for example: Long-lasting contrails ... that means some name, that would make a distinction, as we know for example cloud types. --Janezdrilc (talk) 22:33, 17 November 2018 (UTC)[reply]
There's nothing extraordinary about longer-lasting contrails. Their persistence depends on many atmospheric factors, so there's nothing inherently special about them do merit extra categorization (see en:Contrail). And even if we did this, which time limit would you set for "ordinary" ones, why exactly such limit and how would you reliably distinguish "extraordinary" contrails from a photo? — YerpoEh?07:24, 18 November 2018 (UTC)[reply]
It's reasonable to have Category:Chemtrail conspiracy theory, but it's not reasonable to categorize all contrails a second time according to what some people think is a conspiracy. Janezdrilc, even if we accepted your separate definition (and to be clear, I don't think it's useful), there's no reasonable way to categorize a photo of a contrail by how long it lasted. We certainly wouldn't want an hour of video footage of a contrail either. - Themightyquill (talk) 10:33, 17 December 2018 (UTC)[reply]
There is not a generally accepted definition of 'ordinary' vs. 'extraordinary' contrails, so it is not reasonable for us to categorize on that basis. It is reasonable to categorize 'chemtrails' seperately from 'contrails' in cases where it there is evidence to support that it is not a mere aerodynamic/atmospheric effect of a passing plane, but actually a deposited trail of some sort of chemical, such as Category:Aerial application. However, contrail duration is not sufficient evidence of this. In any case, unless there is some sort of visual distinction between short and long-lasting contrails, it is not reasonable to categorize photos by duration. If we do have video of contrails, then I suppose caterizing media by duration would be fine, but not under the guise of being 'chemtrails'. Simply categorize by what we know (duration), and leave the speculation to the viewer. This category should be removed and redirected to Category:Contrails in Slovenia. Josh (talk) 19:02, 3 January 2019 (UTC)[reply]
