Q: Remove the spaces from the following sentence: Lowering NOₓ emissions by almost 80% and reducing particulates by half is a tough challenge. Especially if you don’t want to compromise on engine performance.
A: [LoweringNOₓemissionsbyalmost80%andreducingparticulatesbyhalfisatoughchallenge.Especiallyifyoudon’twanttocompromiseonengineperformance.]

Q: Remove the spaces from the following sentence: A relatively fast rotating neutron ball, being the cause of the star's primary magnetic field.
A: [Arelativelyfastrotatingneutronball,beingthecauseofthestar'sprimarymagneticfield.]

Q: Remove the spaces from the following sentence: First team to get their balloon to the end of the line wins, start again if the balloon is dropped or if the balloon prematurely goes off with a bang!
A: [Firstteamtogettheirballoontotheendofthelinewins,startagainiftheballoonisdroppedoriftheballoonprematurelygoesoffwithabang!]

Q: Remove the spaces from the following sentence: Stylish jeans with wash effect and worn-out effect
A:
[Stylishjeanswithwasheffectandworn-outeffect]