I want to share what my friends have been up to recently, other than complaining about the bad air quality. One friend gave up his consulting business and opened an online store selling PM 2.5 masks. I'm pretty sure his business is booming. Another friend tried to convince us to invest money by buying stocks of air purifier manufacturers. Another friend learned that the US Embassy in Beijing was using Blueair Air Purifiers, so snatched one up before they went out of stock. Another friend resumed smoking, reasoning we are all doomed anyway. Another friend started a competition on Wechat, seeking the most stylish air filter mask.