From the article:
“Encourage everyone in the world with access to the internet to report whether they can or cannot smell. Make it easy for them to do so. Find widely admired people with big social-media followings to make short videos on the subject — at the bottom of which there’d be a simple button that allows anyone watching to report their sense of smell. Go viral with the virus. Before long you’d have a pile of data that smart analysts could use to map it, and evaluate its risks. The results might not be perfect, but they were far better than what we have now in any rich country and far better than what they might ever have in countries with fewer resources.”
Please get checked if you feel you're losing your sense of smell.