Water vapor in the air....
pollutants in the water
Rainwater in industrial areas can become acidic due to pollutants like sulfur dioxide and nitrogen oxides released from industrial activities. These pollutants can react with water in the atmosphere to form sulfuric acid and nitric acid, lowering the pH of the rainwater.
Mineral deposits form when minerals dissolve in water and then solidify in cracks or spaces in rocks. Over time, these deposits can become buried underground through processes like sedimentation, volcanic activity, or tectonic movements.
A pure luck?
Pollutants dumped into the air can eventually get into your body when you eat, drink and breathe. Pollutants in the air fall to earth with the rain drops and snow flakes. The pollutants then become more and more concentrated by biomagnification as they move up the food chain to you.
Thermal inversion layers trap pollutants because they form a barrier in the atmosphere that prevents the vertical mixing of air. This causes pollutants to become concentrated and trapped near the Earth's surface, leading to poor air quality.
natural deposits of coal and iron.
Fog in industrial areas can be thick due to pollution emitted by factories and industrial processes. The pollutants released can act as condensation nuclei for water droplets to form, increasing the density of the fog. Additionally, industrial areas tend to have lower wind speeds, allowing the fog to linger and become denser.
The tendency of chemicals to become more concentrated as they move up the food chain is known
Evaporation itself does not get polluted, but pollutants present in the water may become more concentrated during the evaporation process. When water evaporates, pollutants such as heavy metals and chemicals are left behind, potentially contaminating the remaining water. This can pose a risk to the environment and human health if the concentrated pollutants are not properly managed.
The air becomes stiller, hence the air becomes murky because dust and pollutants are no longer lifted from the surface. This can become a problem in cities where many pollutants exist. During a severe inversion, trapped air pollutants form a brownish haze that can cause respiratory problems.
Precipitation: rain, snow, hail, sleet. Some pollutants may cause the precipitation to be chemically active and irritating to living things, in which case it may be called "acid rain."