Question

All are particulate pollutants except?
A) Dust
B) Ozone
C) Soot
D) Smoke

Answer 1

Hint: We have to know that particulate matter consists of soot, flash, dust of various types, fur, hair, spores etc. They are classified into settled and suspended particulate matter. Particulate matter is the sum of all solid and liquid particles suspended in air, many of which are hazardous.

Complete answer:
We need to know that the particulate matter (PM) is a term used to describe the mixture of solid particles and liquid droplets in the air. It can be either human-made or naturally occurring. Some examples include dust, ash and sea-spray. Particulate matter is composed of solid and liquid particles in the air that are small enough to be inhaled. Natural sources of PM include sea salt, dust (such as airborne soil), and pollen, but it also includes material from volcanic eruptions and particles formed from natural gaseous precursors (e.g, sulphates).
Option B is correct as ozone is a colorless gas which is a form of oxygen. There is a layer of ozone high above the Earth's surface, which protects us from harmful radiation from the sun.
Tropospheric or ground-level ozone – what we breathe – is formed primarily from photochemical reactions between two major classes of air pollutants, volatile organic compounds (\[VOC\]) and nitrogen oxides (\[NOx\]).

Option B is correct.

Note:
Most particles form in the atmosphere as a result of complex reactions of chemicals such as sulfur dioxide and nitrogen oxides, which are pollutants emitted from power plants, industries and automobiles. The complex mixture includes both organic and inorganic particles, such as dust, pollen, soot, smoke, and liquid droplets.