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When moist, warm air rises to a cooler elevation, and water condenses onto microscopic dust-like “seeds”, bacteria or ash. Air and seeds that updraft = clouds.
Clouds reflect the suns light, which causes them to appear white.
Big clouds are normally made up of water droplets and have a base under 2,000 meters.
High altitude clouds are usually made up of ice crystals, which can also serve as seeds, and have a base somewhere between 5,500 and 14,000 meters.
People have actually tried to do that, on several occasions, with an attempt to end global warming by shooting crystal salt seeds at clouds, causing a permanent low hanging cloud cover that will deflect the sunlight and stop global warming. The experiment proved to be unsuccessful when the scientists realized that excess cloud cover might actually warm the planet by trapping heat. In fact, a 2009 Stanford University Study shows that aircrafts, which create clouds are accountable for 4 to 8 percent of the warming that has occurred since record keeping began in 1850.
Working days cause bad weather. A team of American/Israeli scientists have found a correlation between 15 years of pollution records and the “National Weather Service Storm Prediction Center’s” records on storms. Their findings were that storms over the United States peak during working days, meaning in mid-week, when air pollution is at its worst.