Which among the following environmental pollutants are responsible for "acid rain"?

Which among the following is a secondary pollutant?

Water (Prevention and Control of Pollution) Act was enacted in which of the following year?

According to the Environmental Protection Agency (EPA), which one of the following is the largest source of Sulphur dioxide emissions?

Which of the following causes maximum indoor chemical pollution?

Which of the following is NOT correct about 'Fly Ash' pollution?