Understanding the Air Quality Index (AQI) in India

The Air Quality Index (AQI) is a tool used by government agencies to communicate to the public how polluted the air currently is or how polluted it is forecast to become. It focuses on health effects that one might experience within a few hours or days after breathing polluted air. In India, the Ministry of Environment, Forest and Climate Change (MoEFCC) launched the National Air Quality Index (NAQI) in 2014.

Pollutants Monitored in India's AQI

The AQI in India is based on eight key pollutants. Monitoring the levels of these specific pollutants helps in assessing the overall air quality and issuing health advisories. The eight pollutants are:

• Particulate Matter (\(\text{PM}_{10}\))
• Particulate Matter (\(\text{PM}_{2.5}\))
• Ozone (\(\text{O}_3\))
• Carbon Monoxide (\(\text{CO}\))
• Sulphur Dioxide (\(\text{SO}_2\))
• Nitrogen Dioxide (\(\text{NO}_2\))
• Ammonia (\(\text{NH}_3\))
• Lead (\(\text{Pb}\))

Analyzing the Given Options

Let's examine the provided options to determine which pollutant is included in the Air Quality Index in India:

• Carbon Dioxide (\(\text{CO}_2\)): Carbon dioxide is a major greenhouse gas and a primary contributor to climate change. While it affects the global atmosphere, it is generally not included as one of the standard pollutants in the daily Air Quality Index, which focuses on pollutants with direct and short-term impacts on human respiratory health and visibility.
• Chlorofluorocarbons (CFCs): Chlorofluorocarbons are synthetic compounds that were historically used in refrigerants and aerosols. They are known for causing depletion of the ozone layer. However, they are not typically included in the standard Air Quality Index, which monitors ambient air pollutants affecting health at ground level.
• Sulphur dioxide (\(\text{SO}_2\)): Sulphur dioxide is a toxic gas produced by the burning of fossil fuels containing sulphur, such as coal and oil. It is a significant air pollutant that can cause respiratory problems and contributes to acid rain. Sulphur dioxide is explicitly listed as one of the eight pollutants monitored under the Air Quality Index in India.
• Methane (\(\text{CH}_4\)): Methane is a potent greenhouse gas produced from natural sources and human activities like agriculture and fossil fuel production. Like carbon dioxide, it is primarily relevant to climate change and is not included in the standard list of pollutants monitored for the Air Quality Index.

Conclusion

Based on the list of pollutants included in the Air Quality Index in India, Sulphur dioxide is one of the monitored substances.

Therefore, Sulphur dioxide is the correct answer among the given options.

Revision Table: India AQI Pollutants

Additional Information on Air Quality Index

The AQI categorizes air quality into different levels, each associated with potential health impacts and recommended cautionary statements. Understanding these categories helps the public take necessary precautions.

• AQI Categories: The AQI scale in India typically ranges from 0 to 500 and is divided into six categories: Good, Satisfactory, Moderate, Poor, Very Poor, and Severe.
• Health Implications: Each category has specific health advisories for sensitive individuals (like children, the elderly, and those with respiratory/heart diseases) and the general public. For example, a 'Severe' AQI indicates that air quality is likely to affect healthy people and seriously impact those with existing diseases.
• Sources of Pollutants: These pollutants come from various sources including vehicular emissions, industrial activities, power plants, construction dust, biomass burning, and household combustion.
• Importance of Monitoring: Continuous monitoring of these pollutants is crucial for assessing air quality trends, understanding sources of pollution, and developing strategies for pollution control.