1. What is the causes of fall of Du level. 2. Which is the good ozone situated and named so?

Question

In 1990, the ozone thickness in a particular area was 190 Du while in 2001 and 2005 it was decreased to 150 Du and 135 Du respectively.

1. What is the causes of fall of Du level.

2. Which is the good ozone situated and named so?

Answer 1

1. It is due to the increased emission of chloro fluro carbons. It causes the upset of balance between formation and degradation of ozone and results in ozone depletion or thinning of ozone layer.

2. Ozone found in stratosphere filter uv rays coming into the earth.