3.4. Photochemical oxidant formation and particulate matter formation
Coal and fuel oil scenarios again have the highest impact in photochemical oxidant formation and particulate matter formation. In both cases, the main impact is due to the emissions during combustion, which contributes to more than 65% of the life cycle impact in both scenarios and categories.
The results for other scenarios are higher than in the solar-only scenario mainly due to the emissions given off during combustion and production of each fuel, except for wood pellets whose impact is mainly attributed to the electricity consumption during its manufacturing.