Pollution in a city can considerably affect the health of those who live there, for example in terms of health (Co2 can create cancer ... but also in terms of a person's mental aspct, on his brain). I am a French girl and I live in Paris (a quite polluted city). However, the mayor of Paris has tried to put in place certain measures to eliminate this pollution (such as, for example, the fact of thinking about the installation of a sustainable city, carpooling, travel by bicycle ...) and now the pollution is reduced here!
Pollution can affect the environment and humans by The effects of air pollution on a person's health can range from mild breathing difficulties to severe cardiovascular issues, including heart disease and stroke
To add, absolute water depth has nothing to do with the difference between shallow and deep-water waves. On the other hand, the ratio of the water’s deep to the wavelength of the wave is that one that determines it. A deep-water wave’s water molecules proceed in a circular orbit while the orbit of the molecules of shallow-water waves molecules’ orbit are elliptical.