It is true that quality of water and air are heavily polluted in many developing countries due to both industry and construction activities. Although, governments should take control over listed problems by raising public awareness and restricting some factories.
One of the most possible solutions to the problem of air and water pollution is to raise public awareness. If governments enable some stricter laws and inform to the public about the importance of protecting air and water it may encourage feeling of responsibility. When people understand that careless response may lead to catastrophic consequences, they are more likely to not make it worse. For example, the Japanese government published video about water and air pollution through social media, it reflected positively on people and they minimized the water usage and the quality of the air changed to the good side.
Another effective solution governments could take is to enable laws to factories to use environmentally friendly devices, which may reduce production of harmful gas «carbon dioxide». For instance, governments may enable taxes on factories which exceed the given limit. A good example is Uzbekistan, where government put limitation on factories setting a maximum carbon footprint for companies. Factories which overproduce the carbon emission were fined and their licenses are taken. As a result, the quality of air in country significantly improved over the last few years.
In conclusion, while people and companies are the main pollutants of air and water in developing countries, governments can put strict environmental laws and raise public awareness.