The air pollutant not obtained by combustion is

RRB Staff Nurse Jaipur-6th June 2018

General Knowledge

Easy

Appeared in: RRB Staff Nurse Jaipur-6th June 2018

Explanation

Ammonia (NH₃) is the correct answer as it is not typically produced during combustion.
The primary sources of atmospheric ammonia are agricultural, including the breakdown of animal waste and the use of nitrogen-based fertilizers.
Industrial processes for producing fertilizers also release ammonia.
While combustion of nitrogen-containing materials occurs, it leads to the formation of nitrogen oxides (NOx), not ammonia (NH₃).

Option A: Carbon dioxide (CO₂) is a well-known primary product of the complete combustion of carbon-based materials, including fossil fuels like coal, oil, and natural gas.
Option B: Nitrogen dioxide (NO₂) is a prominent pollutant formed during high-temperature combustion processes, such as those in vehicle engines and power plants, where atmospheric nitrogen reacts with oxygen.
Option D: Sulphur dioxide (SO₂) is directly produced from the combustion of fossil fuels that contain sulfur, most notably coal and heavy oil.

Visual 1: Infographic: A chart comparing the primary sources of different air pollutants (CO₂, SO₂, NOx, NH₃), clearly showing combustion sources for the first three and agricultural/industrial sources for ammonia.
Visual 2: Diagram: A simple illustration of a combustion reaction (e.g., burning wood) showing the release of CO₂, SO₂, and NOx, contrasted with a diagram of a farm showing ammonia release from fertilizer and livestock.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Sources of major air pollutants as background academic context rather than a clinical decision trigger.
While this is an environmental science question, nurses should understand the health impacts of air pollutants. Exposure can cause or worsen respiratory conditions like asthma and COPD, which are common patient complaints.
High levels of pollutants like NO₂ and SO₂ can cause airway inflammation, reduce lung function, and increase susceptibility to respiratory infections.
Ammonia is a respiratory irritant at high concentrations, which can be an occupational hazard for farm workers or those near industrial spills.

How to Approach the Question

First, identify the core process in the question stem, which is 'combustion' (burning).
Next, notice the negative keyword 'not'. This means you are looking for the option that is an exception, the one that is NOT produced by burning.
Systematically review each option and recall its primary source.
Recall that Carbon dioxide (from burning anything organic), Sulphur dioxide (from burning coal/oil), and Nitrogen dioxide (from high-temperature burning in engines) are all classic combustion byproducts.
Recognize that Ammonia is primarily associated with agriculture (fertilizers, manure) and decomposition, not burning.
This process of elimination identifies Ammonia as the correct answer because its source is different from the others.

Concept Tested & Keywords

Concept Tested: Sources of major air pollutants
Stem keywords: air pollutant, combustion
Lead-in keywords: not obtained
Negative lead-in flag: The question asks for the pollutant NOT obtained by a specific process.

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