The study looked at how sulfur dioxide (SO2) affects chlorophyll in plants from the Brassicaceae family. When exposed to different levels of SO2, the total chlorophyll content in the plants decreased significantly. Both chlorophyll a and b were reduced, likely due to changes in chloroplast structure and conversion to phaeophytin. Spraying calcium hydroxide helped increase plant yield in SO2-exposed plants. The highest reduction in chlorophyll was seen at 3918 µg m-3 of SO2. This shows that SO2 breaks down chlorophyll molecules by causing a loss of magnesium and total chlorophyll.