Explanation: Mumbai, the financial capital of India and one of the largest cities in the world, faces significant environmental challenges, particularly in terms of air pollution. The city's air quality is consistently poor, and it is often ranked among the most polluted cities globally, especially when considering mega cities with populations over 10 million.
The primary factors contributing to Mumbai's poor air quality include:
1. **High Population Density**: Mumbai is one of the most densely populated cities in the world, with a population of over 20 million. This high density leads to increased vehicular emissions, industrial activities, and construction, all of which contribute to air pollution.
2. **Vehicular Emissions**: The city has a large number of vehicles, including cars, buses, and trucks, which emit pollutants such as carbon monoxide, nitrogen oxides, and particulate matter. The high volume of traffic, especially during peak hours, exacerbates the problem.
3. **Industrial Activities**: Mumbai is a major industrial hub, with numerous factories and industries operating within and around the city. These industries release pollutants into the air, contributing to the city's poor air quality.
4. **Construction Activities**: The rapid urbanization and construction activities in Mumbai also contribute to air pollution. Dust from construction sites and emissions from construction equipment add to the overall pollution levels.
5. **Lack of Green Spaces**: Mumbai has limited green spaces, which are crucial for absorbing pollutants and improving air quality. The lack of sufficient green areas exacerbates the pollution problem.
6. **Meteorological Factors**: The city's geographical location and weather patterns can also affect air quality. For example, during the winter months, the inversion layer can trap pollutants close to the ground, leading to higher pollution levels.
The World Health Organization (WHO) and other environmental agencies regularly rank Mumbai among the most polluted cities in the world. The city's air quality index (AQI) often exceeds the safe levels recommended by the WHO, indicating a significant public health risk.
Efforts to improve air quality in Mumbai include the implementation of stricter emission standards for vehicles and industries, the promotion of public transportation, and the creation of more green spaces. However, the city still faces significant challenges in reducing pollution levels to a safe and healthy standard.
In conclusion, Mumbai is indeed ranked within the top 10 most polluted mega cities globally, making option (A) the correct answer. The city's high population density, industrial activities, and vehicular emissions are the primary contributors to its poor air quality. Understanding these factors is crucial for addressing the environmental challenges faced by Mumbai and similar urban centers.