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#1. Which of the following Concentration Ozone in ambient air is considered good?
The correct answer: A. Upto 0.06 ppm
- The U.S. Environmental Protection Agency (EPA. has established the National Ambient Air Quality Standards (NAAQS) for ground-level ozone to protect public health. The current standard is set at 0.070 parts per million (ppm) for an 8-hour average.
- Concentrations at or below this level are considered acceptable and are unlikely to cause adverse health effects for the general population.
- Among the options provided, only option (A. “Up to 0.06 ppm” falls below the EPA’s threshold of 0.070 ppm. Therefore, option (A. represents a concentration considered good for ambient air quality.
Explanation of Other Options:
- Option (B. Up to 0.18 ppm: This concentration exceeds the EPA’s standard and is considered unhealthy, potentially leading to respiratory issues and other health problems.
- Option (C. Up to 0.15 ppm: Similarly, this level is above the recommended standard and can have detrimental health effects, especially for sensitive groups.
- Option (D.Up to 0.20 ppm: This concentration is significantly higher than the acceptable limit and poses serious health risks to the general population.
It’s important to note that while the EPA’s standard is 0.070 ppm, the World Health Organization (WHO) recommends even more stringent guidelines, suggesting that ozone concentrations should not exceed 100 µg/m³ (approximately 0.051 ppm) for an 8-hour mean to safeguard public health.
#2. The intensity of normal Conversation in decibel is between:
#3. Which of the following processes does not occur in the water cycle?
#4. Match List-1 and List-2 and choose the correct answer from the codes given below:
#5. Match the items given in Column-1 and Column-2 and choose the correct answer from the codes given below:
