CEE 153 F07 PS7-1

CEE 153 F07 PS7-1 - UNIVERSITY OF CALIFORNIA LOS ANGELES...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
UNIVERSITY OF CALIFORNIA, LOS ANGELES Civil and Environmental Engineering Department CEE 153 Introduction to Environmental Engineering Science Fall Term 2007 T-Th 2-4 PM MS 4000A Prof. K. D. Stolzenbach 5732J Boelter Hall, 206-7624 [email protected] Problem Set # 7 (due Thursday December 6) _____________________________________________________________________________ 1. Use the information below and the Air Quality Index chart to determine the AQI and the air quality description for a day in which the following maximums occurred. Follow the general instructions given in the text for the old Pollutant Standards Index (PSI): 1-hr O 3 concentration 0.15 ppm 8-hr CO concentration 12 ppm 24-hr PM 10 concentration 150 μ g/m 3 24-hr SO 2 concentration 0.12 ppm 1-hr NO 2 concentration 0.4 ppm [AQI = 143]] SO 2 PM 10 PM 2.5 O 3 8-hour O 3 1-hour NO 2 CO Concentration Ranges Pollutant Index Value Hazardous Very Unhealthy Unhealthy Unhealthy for Sensitive Groups Moderate Good Category .805 - 1.004 .605 - .804 .305 - .604 .225 - .304 .145 - .224 .035 - .144 0 - .034 505 - 604 425 - 504 355 - 424 255 - 354 155 - 254 55 - 154 0 - 54 350.5 - 500.4 250.5 - 350.4 150.5 - 250.4 65.5 - 150.4 40.5 - 65.4 15.5 - 40.4 0 - 15.4 -- -- .125 - .374 .105 - .124 .085 - .104 .065 - .084 0 - .064 .505 - .604 .405 - .504 .205 - .404 .165 - .204 .125 - .164 -- -- 1.65 - 2.04 1.25 - 1.64 0.65 - 1.24 -- -- -- -- 40.5 - 50.4 30.5 - 40.4 15.5 - 30.4 12.5 - 15.4 9.5 - 12.4 4.5 - 9.4 0 - 4.4 401 - 500 301 - 400 201 - 300 151 - 200 101 - 150 51 - 100 0 - 50 Air Quality Index (AQI) 2. A freeway has 10,000 vehicles per hour passing a house 200 m away. Each car emits an average of 1.5 g/mi of NO x , and the wind is blowing at 2 m/s across the freeway toward the house. Estimate the NO x concentration at the house on a clear summer day at noon (neglect any reactions involving NO x ). [0.038mg/m 3 ] 3.
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern