plants for green buildings · results primary dependent variable totals mean score no plants mean...
TRANSCRIPT
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PLANTS FOR GREEN BUILDINGS
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DR BC WOLVERTON
“The ability of indoor plants to improve the quality of the air we breathe is now accepted scientific fact”
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Improvement in air quality
Reduction in health complaints
Reduced absenteeism
Increased productivity
Increased sense of well being
GLOBAL RESEARCH
Research from around the globe has shown indoor plants have the following primary benefits:
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Volatile Organic Compounds (VOC’s)
VOC’s are responsible for more than 1.6 million deaths each year, according to a 2002 World Health Organization report.
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USEPA ranks indoor air pollution among top 5 threats to human health
More than 900 VOC (volatile organic compounds) can be present in indoor environmental air.
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Sydney University of Technology showed plants helped to reduce VOC’s between 50 to 75% within 24 hours
Wolverton Environmental Services Inc. showed 50 to 65% of VOC removal can be attributed to root & soil microbes
NATURE’S AIR PURIFIERS
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INCREASED CONCENTRATION
High carbon dioxide levels can cause
drowsiness, headaches and affect concentration levels
Sydney University of Technology found that in air-conditioned buildings plants reduced carbon dioxide levels by 10%
In buildings that were not air-conditioned, figure rose to 25%
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ABSENTEEISM
Research in Norway showed plants reduced absenteeism by 30%
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SOUTH AFRICAN RESEARCH PROJECTS
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IMPROVEMENTS IN IEQ
• 21% reduction in CO2 levels
• 3% reduction in ambient temp
• Stabilization of ambient temp
• Stabilization of humidity levels
• But 8% reduction in humidity
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IMPACT ON STAFF WELL BEING
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RESULTS
PRIMARY DEPENDENT VARIABLE TOTALS
MEAN SCORE NO PLANTS MEAN SCORE PLANTS TREND
1. Employee Physical Wellbeing 2.8947 3.0064
2.Employee Psychological Wellbeing 3.5894 3.6057
3.Perceptions of the Work Environment 3.2076 3.2598
4.Empolyee Work Engagement 3.8677 3.7842
There is evidence of an upward trend in the data collected across
all three assessments.
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EXPLANATION
• A large number of employees did not stay in the same area throughout all three assessments.
• There was a Significant event that took place in the area, which no doubt impacted the results of this study.
• The plants were not in for long enough.
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• 2.67% reduction in CO2 levels
• 0.22% reduction in ambient temp
• 16.62% reduction in humidity levels
IMPROVEMENTS IN IEQ
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• 20% reduction in Total VOC’s
• 14.29% reduction in Benzene levels
• 7.69% increase in Xylene
IMPROVEMENTS IN IEQ
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IMPACT ON EMPLOYEE WELL-BEING
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WHAT WAS ASSESSED
1) Work Engagement
2) Psychological Well-Being
3) Physical Well-Being
4) Aesthetics of Workplace & Plants
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• There were no significant differences found after introducing plants, on the above variables
• Aesthetics of the workplace and of plants did not affect any of the above relationships
RESULTS
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In the Interiors Tool Indoor Plants will provide 0.5 points
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Minimum Requirements
• Provide 1 x plant unit per 50m2 of regularly occupied office space / 0.5 plant units per full time employee
• 70% of plants must be suited to environment
• 2 year horticultural
maintenance plan
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