Which one of the following fuels causes minimum environmental pollution?

1. The question asks which of the listed fuels causes the minimum environmental pollution upon combustion. 2. Diesel, Coal, and Kerosene are fossil fuels derived from hydrocarbons. Their combustion releases various pollutants, including greenhouse gases (carbon dioxide - CO2), sulfur dioxide (SOx, especially from coal), nitrogen oxides (NOx), particulate matter (soot), and carbon monoxide (CO). 3. Hydrogen (H2) is a fuel that reacts with oxygen during combustion primarily to produce water (H2O). H2 + 1/2 O2 → H2O 4. This process does not produce CO2, SOx, or particulate matter. If combustion occurs in air (which contains nitrogen) at high temperatures, some NOx can be formed, but overall, the environmental pollution from hydrogen combustion itself is significantly lower than that from fossil fuels. 5. Therefore, hydrogen causes the minimum environmental pollution among the options during its use as a fuel. (Note: Pollution associated with hydrogen production depends on the method used).