What is particulate matter?

Which one of the following is the main reason of acid rains?

Methemoglobinemia is caused by the drinking of water contaminated with

Mercury is a toxic substance that severely contaminates land, water, air and the food chain. Which among the following is source of mercury pollution?

The use of plastics has led to a number of environment-related problems. For this, which one of the following statements is correct?

The main component of greenhouse gases is