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v. XXXX Xxxxx v. XXXXX Xxxxxx v. XXXXXX Xxxxxx The Effect of Varying Levels of Outdoor-Air Supply on the Symptoms of Sick Building Syndrome BCEE 6961 Teacher : Dr. O. A. Pekau Dr. James Hanley 2015

The Effect of Varying Levels of Outdoor-Air Supply on the Symptoms of Sick Building Syndrome Study Conducted • Conducted by Massachusetts Medical Society NO, by the au’s. Medical Society PUBLISHES NEJM • Duration of 6 Weeks in 4 Buildings… • Opposite Ventilation Rates in 2 Buildings • Ventilation Increased for 1 st Week & Decreased for 2 nd • Reverse the prev. 2 bullets • 20 or 50 cu. ft. per minute person • 1546 Participants, serving their own comparison • Carbon dioxide concentration around 600 or 1000 ppm • V short Intro helpful to situate the study. WHY was study done? 2

The Effect of Varying Levels of Outdoor-Air Supply on the Symptoms of Sick Building Syndrome MEASUREMENTS During the Study • Obtaining Feedback • 1. Carbon dioxide levels 8 to 12 sites per floor • Levels taken Mid Afternoon at pts. nearest to Participants • 2. Questionnaire Were Done administered to workers • 3. Levels of formaldehyde, nitrogen oxides, carbon monoxide, total airborne dust etc were checked 3

The Effect of Varying Levels of Outdoor-Air Supply on the Symptoms of Sick Building Syndrome After the Study ? ? ? • Obtained Feedback • Participants proposed difficulties ? ? ? Wording is odd • Irritation in eyes, nose and throat what about it ? Wasn’t that assessed DURING study • More on the days of High Ventilation ? ? ? Seems like a result, but what was more? • Logistic Regression was used to avoid odds ? ? VERY ODD. . Read again 4

The Effect of Varying Levels of Outdoor-Air Supply on the Symptoms of Sick Building Syndrome Results of the Study • Result • Logistic Regression was used to? ? ? many times … part of Me. THODS, not result • No Association OF WHAT? with carbon dioxide, humidity, temperature or air velocity • But association of WHAT? with environmental ratings was found. Details? Not much info as written 5

The Effect of Varying Levels of Outdoor-Air Supply on the Symptoms of Sick Building Syndrome Facts? ? ? About the Study • Possible Interferences <- meaning of this word? • Some participants were aware of the ventilation conditions. SO? • The buildings maynot be sick were chosen randomly. Correct. And important criticism, but put more cogently • New b. Buildings with new furnishings have increased concentrations of contaminants so increasing outdoor air supply maybe beneficial for THEM • Parameter to measure Indoor Air Quality was Carbon dioxide which is just 13% of total contaminants in the air inside a building • Some work spaces were not air tight and were receiving outdoor air 6

Thank you for your attention ! How do you know audience was paying attaention, and not just checking Facebook? Questions - Answers Could be crisper. . Did you try out your STORY on others ? 7