Assessing Pollution

• Indicator species like bloodworms and sludgeworms can assess water pollution levels, while freshwater shrimps and stonefly indicate clean water
• Lichen and Blackspot fungus asses the levels of pollution by indicating levels of SO2 in the air by the presence of lichen and black spots on leaves
• Freshwater shrimp, Stone fly and Dragon fly asses the levels of high oxygen in the water.

  More of these organisms in the water = higher O2 levels in water
• Bloodworm and sludge worm assess the low levels of CO2 in the water.

  More of these organisms = lower levels of O2 in the water