El humo que cae: Física detrás de corrientes y densidad

If the past few years are any indication of what kind of summer weather to expect this year, we should really be thinking about how to protect our lungs. We can probably expect heat waves that trap smog and pollution in cities, wildfire smoke that affects wide areas (not only cities), and long stretches without rain to wash any of it out. Because such conditions can really irritate lungs, I don't want to risk it, so I pack mullein every single summer if we are going anywhere. Mullein has been su

Is There Pollution in China? | China Travel & Life