Text: Adopting a unified approach to reduce SO2, NOx and mercury is better than looking at each pollutant separately because of synergistic effects.
Entailment: Since SO2, NOx and mercury potentiate each other, a unified approach to reducing their levels is more accurate than considering them one by one.
Contradiction: Mercury, NOx, and SO2 are best considered in harm reduction by themselves, since they bear no relation to each other.