Perhaps you should try some spelling variations:
"pollutant dispersion reduction" » "pollutant dispersion prediction", "pollutant dispersion predictions", "pollutant dimension reduction"
"pollutant emissions prediction" » "pollutant emission prediction", "pollutant emissions reduction", "pollutant emissions production"

Try widening your search to All Fields.

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 emissions prediction")).
• Removing quotes may allow a broader search: (( pollutant dispersion reduction ) or ( pollutant emissions prediction )).
• Adding a wildcard symbol may retrieve word variants: (("pollutant dispersion reduction") or ("pollutant emissions prediction"))*.