My opinion 99% is not accurate, to find the good air you have to look through the basic information: website, twitter, telegram (other social networks ..), project development team, whitepaper, ... And to increase the reliability, the feasibility of the project side you should chat with admin or community via telegram (or discord) to ask about project.
Now that I'm doing airdrop PRIVACY coin, you can go to https://www.privcy.io/ for more details about a quality & potential airdrop.