What would the world look like if there were no aerosols in the atmosphere?

According to the knowledge of colloid and surface chemistry, the size of dispersed phase in aerosol is 1 to 100000 nm, not 1 to 100 nm! Fog, smoke, haze, dust and so on are all aerosols. The dispersed phase in large aerosol is the condensation nucleus of rain, the absorber and scatterer of solar radiation, and participates in various chemical cycles. It can be said that there is no rain without aerosol, rivers and lakes will dry up, ultraviolet rays will kill people, and so on. Such a world can't survive. Of course, the smog in recent years is also aerosol and harmful.