### Air Quality Modeling Exercise: Boise, Idaho**Overview:**This exercise focuses on an area source box model for Boise, Idaho, to analyze air quality during winter conditions.**Model Dimensions:**- The area of interest is a rectangular "box" with dimensions of 9 km by 18 km.- A temperature inversion occurs at 100 m height, impacting the mixed layer height above the surface.**Wind and Vehicle Data:**- A clean breeze blows perpendicular to the city’s 9 km side at a speed of 1.2 m/s.- On average, there are 800,000 vehicle miles traveled (VMT) per hour from 6 AM to 8 PM.- Each vehicle emits 8.84 grams of CO per mile.**Tasks:****a. Calculating CO Mixing Ratio at 8 PM**- Assume an initial CO mixing ratio of 150 ppbv.- Incoming air brings CO at a mixing ratio of 150 ppbv.- Given conditions: Pressure (P) = 1 atm, Temperature (T) = 0 °C.**b. Evaluating the Ventilation Coefficient**- Determine if the current ventilation conditions should trigger an air stagnation advisory.**Analysis Considerations:**- **CO Emissions Analysis:** Calculate the total CO emissions from vehicles and determine the resultant CO mixing ratio in the air.- **Ventilation Coefficient:** Assess the rate at which air is replaced or removed from the area, and decide on the necessity of an air stagnation advisory based on air quality standards.

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5. Consider an area source box model for Boise, Idaho. The "box" has a dimension of 9 km x 18 km. In winter there is a temperature inversion at 100 m height that determines the mixed layer height above the surface. A clean breeze blows perpendicular to the city's 9 km dimension at 1.2 m/s. On average there are 800,000 vehicle miles travelled (VMT) per hour from the hours of 6 AM to 8 pm PM. Each vehicle emits 8.84 grams co per mile. a. Calculate the CO mixing ratio at 8 PM. Assume initial CO mixing ratio of 150 ppbv, and the wind brings air into the city with a CO mixing ratio of 150 ppbv. Assume P = 1 atm, T = 0 °C b. What is the value of the ventilation coefficient and does an air stagnation advisory need to be called?

5. Consider an area source box model for Boise, Idaho. The "box" has a dimension of 9 km x 18 km. In winter there is a temperature inversion at 100 m height that determines the mixed layer height above the surface. A clean breeze blows perpendicular to the city's 9 km dimension at 1.2 m/s. On average there are 800,000 vehicle miles travelled (VMT) per hour from the hours of 6 AM to 8 pm PM. Each vehicle emits 8.84 grams co per mile. a. Calculate the CO mixing ratio at 8 PM. Assume initial CO mixing ratio of 150 ppbv, and the wind brings air into the city with a CO mixing ratio of 150 ppbv. Assume P = 1 atm, T = 0 °C b. What is the value of the ventilation coefficient and does an air stagnation advisory need to be called?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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### Air Quality Modeling Exercise: Boise, Idaho

**Overview:**

This exercise focuses on an area source box model for Boise, Idaho, to analyze air quality during winter conditions.

**Model Dimensions:**
- The area of interest is a rectangular "box" with dimensions of 9 km by 18 km.
- A temperature inversion occurs at 100 m height, impacting the mixed layer height above the surface.

**Wind and Vehicle Data:**
- A clean breeze blows perpendicular to the city’s 9 km side at a speed of 1.2 m/s.
- On average, there are 800,000 vehicle miles traveled (VMT) per hour from 6 AM to 8 PM.
- Each vehicle emits 8.84 grams of CO per mile.

**Tasks:**

**a. Calculating CO Mixing Ratio at 8 PM**
- Assume an initial CO mixing ratio of 150 ppbv.
- Incoming air brings CO at a mixing ratio of 150 ppbv.
- Given conditions: Pressure (P) = 1 atm, Temperature (T) = 0 °C.

**b. Evaluating the Ventilation Coefficient**
- Determine if the current ventilation conditions should trigger an air stagnation advisory.

**Analysis Considerations:**

- **CO Emissions Analysis:** Calculate the total CO emissions from vehicles and determine the resultant CO mixing ratio in the air.
- **Ventilation Coefficient:** Assess the rate at which air is replaced or removed from the area, and decide on the necessity of an air stagnation advisory based on air quality standards.

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