Question

The Pollution Standard Index (PSI) scale has span from :
(A) $0-200$
(B) $0-300$
(C) $0-400$
(D) $0-500$

Answer 1

To solve the given problem, we should have information about air pollution, its harmful effects and so on. The presence of harmful substances or particulates in quantity more than required contributes to air pollution. They become detrimental to human health and other organisms as well. They are mostly originated because of our own negligence and also from energy use and production. Air pollutants also include harmful gas like nitric acid , PAN , ozone , sulphur dioxide, carbon monoxide and so on.

Complete answer:
Step-1 :
We have heard about the use of the Air Quality Index and they have many types including Pollution Standard Index. It basically tells us about the amount of pollutants present in air over a region.
Step-2 :
A PSI from $0-50$ represents satisfactory air quality, $50-100$ has an acceptable air quality with $100-150$ having some allergies and so on. The PSI from $300$ and higher is hazardous and requires health emergency conditions.
Step-3 :
The usual Pollution Standard Index scale has a span from $0-500$ with $500$ being the extreme limit and is hazardous and with increase in the level above $500$ , the pollution levels become worse.
Hence ,the correct option is (D).

Additional Information:
Air Pollution can cause severe effects including cancer, asthma and other respiratory diseases like bronchitis and sinusitis. It also causes skin and eyes irritation along with reddening of eyes. When inhaled, it causes Nervous system issues by impregnating the pollutant particles in CNS (Central Nervous System ).

Note:
Air Pollution causes global warming, climate change, acid rain and also smog effects too. Global warming is the increase in the temperature of Earth due to pressure of pollutant gases like carbon dioxide, methane, etc. Climate change is an effect of global warming also causing other effects like acid rain and smog effects.