Perhaps you should try some spelling variations:
"pollutant dispersion reduction" » "pollutant dispersion prediction", "pollutant dispersion predictions", "pollutant dispersion relation"
"pollutant dimension reduction" » "pollutant diffusion reduction", "pollutants dispersion reduction", "pollution dimensions reduction", "pollutant dimensionality reduction"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("pollutant dispersion reduction") OR ("pollutant dimension reduction"))*.
• Removing quotes may allow a broader search: (( pollutant dispersion reduction ) or ( pollutant dimension reduction ))*.