This all depends on the county, state or country where you live.
Simply put, If you can walk into a sporting goods store or Wallmart and they are for sale then they are legal in your state. Stores can not sell airguns if they are not legal in the state.
Probably, you would have to research laws laws regarding airguns.
Firecrackers are legal in the UK but fireworks are not Legal. So you can bye fireworks in the UK but not firecrackers.
Ferreting is both legal and popular in the UK.
Logun airguns are made in Willenhall, West Midlands UK and imported by "Pyramyd Air" and "Straight Shooters Precision Airguns" in the USA. You could start there or do a search for Airgun repair on the web and locate someone to repair it for you.
Air you asking about airguns as in Pneumatic tools, or as in shooting.
There are 24,000 legal executives in the UK that are qualified and trained.
Under Mexico rules, airguns are not firearms and so not covered or controlled. Several high power PCP rifles are freely available, Evanix, Career etc. There is not FPE restriction, so it is legal and possible to own airguns with higher FPE outputs than firearms, which are more tightly controlled.
Yes if the regulations do not stipulate otherwise. For instance some areas only allow shotgun usage.
Yes. Gay, lesbians, trans etc is all legal to be in the UK.
Of course it is, the UK is part of Europe, so European approved helmets are legal in the UK.