Why Did Native American Wore Masks

Why were the Sri Lankan cricket players wearing masks and doing fielding on the ground? Is it for their safety concerns or insulting the Indian environment?

I feel this was their dirty tactic to get Virat Kohli's wicket and they were successful in that too. *angry*I have reasons to say this:1. They were playing since morning and pollution in Delhi is more at that time than afternoon when they were making fuss by wearing masks.2. All players of Sri Lankan team were laughing when Virat Kohli declared the inning. Team India didn't want to declare at that time but because the Sri Lankan team was interrupting again and again then Virat Kohli declared the inning.3. Sri Lankan team(in dressing room) was not wearing masks when their batting started.4. Indian team has no problem in playing there even they are humans. Virat Kohli was also playing since morning today and he was running too but neither he nor any other player had any problem.But because of the fuss they created today, Virat Kohli lost his concentration as they were interrupting again and again and got out.He couldn’t complete 300 runs.*crying*Here are some tweets that also show the situation:A tweet from Cricbuzz,And a reply to this,English translation for last image: Mask is called Mukhota in Hindi.“This is my opinion”Thanks for reading.

Why do most Chinese people wear face masks everywhere in the world (airports, out and about) when not all air is polluted? Can they not tell it’s OK, as no one else is wearing masks?

Can't comment for all use cases, but from what I've seen - people in Hong Kong and Taiwan wear face masks because :They have a cold or the flu, and do not want to spread germs. Context is typically when someone needs to go to work or school - but can not skip it;The wearer is female, out in the general public and doesn't want to risk catching germs from others which she feels may impact her pregnancy;They are about to board a plane, are concerned about the quality of the filtered but recycled air, and in order to reduce risk of catching germs - they wear the mask. This can also be at the airport before boarding a plane, or also on public transport - like on the subway or a public bus;I've also seen before, but the rarest of situations - where it is likely the wearer has just completed a medical procedure and are at the airport, in transit returning from a medical vacation destination like - Thailand or Taiwan, where someone has recently completed an angioplasty (nose job) or some facial plastic surgery - the mask obfuscates the bruising or swelling - so people can't see what has been done;In Hong Kong, if you visit a hospital or senior home - you may also wear a mask to both prevent yourself from spreading germs - even if you are not ill, or to capture from those that are sick as well. Masks are available by the front entrance for you to choose to use in many cases.The pollution use case is actually, in my non data driven opinion, more of a rarity. Scooter riders in Taiwan do wear masks, but these are often cloth and not disposable masks to try to block airborne particle inhalation from vehicle exhaust. Singaporeans or Chinese residents have worn masks during high pollution periods, but I think wearing masks to prevent inhalation of pollutants occurs less prominently than the context where individuals wear masks to prevent the individual spread of germs or reducing their own risk to catch them.