Which of the following devices can control air pollution?

Observe the figure and answer the following questions.
$(i.)$ What ecological term is used to describe the $DDT$ accumulation at different trophic levels?
$(ii.)$ List any one effect of $DDT$ accumulation on birds.
$(iii.)$ Will $DDT$ accumulation lead to eutrophication?
$(iv.)$ Does it affect the $BOD$?
$(v.)$ Name a disease caused by the accumulation of any heavy metal.

Exposure to a noise level of $............$ or more for a short period can damage the eardrums,leading to permanent hearing impairment. (in $,dB$)

Eutrophication is often seen in

$A$: Nitrate and phosphate discharge in a water body causes eutrophication.
$R$: This increases the inorganic content in the water body and hence the growth of algal blooms.

What is the new auto fuel policy?