Edited my comment, as I was wrong.
Your photo shows the fuselage, didn't see the photo until now.
Absolutely no idea of Boeing's claims stand up to scrutiny, but the marketing blurb says air quality is better and it sounds logical to me.
@Stonehedge started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Edited my comment, as I was wrong.
Your photo shows the fuselage, didn't see the photo until now.