The most dangerous issue of hazardous waste is that it can contaminate the environment and human health. The six sources of hazardous waste common in Nepal are:

1. Industrial processes – This is one of the major sources of hazardous wastes in Nepal as factories and industries use large quantities of chemicals which, when discarded, form hazardous substances.

2. Agricultural chemicals – These include pesticides, fungicides and insecticides used for crop production which leach into soil and water systems, posing potential risks to humans and wildlife.

3. Automobile exhaust fumes – These contain volatile organic compounds such as carbon monoxide, nitrogen oxides, sulphur dioxide and lead which are all toxic to humans when inhaled or ingested in large quantities over a long period of time.

4. Solid wastes – In Nepal this includes waste generated by households such as plastic bottles and packaging materials which may contain toxins like lead or mercury if not disposed properly; these can also leach into ground water systems if left unchecked.

5. Medical waste – This includes biological material such as syringes or used bandages that can contain bacteria or viruses that could spread disease if not disposed properly; incineration is often the best way to dispose this type of hazardous material safely in Nepal..

6 Electronics waste - Old electronics that have been discarded by households can also be a source of pollutants due to their potentially high levels of heavy metals like mercury or lead; these should be recycled rather than thrown away so they do not pollute the environment unnecessarily..