Indoor air quality of different industries in bangladesh.

1. WELCOME
TO
OUR PRESENTATION

2. INDOOR AIR QUALITY OF DIFFERENT INDUSTRIES
IN BANGLADESH
Presented by
Shahin Mia (ER 14014)
Mehedi Hasan(ER 14041)
Department of Environmental Science and Resource Management

3. Introduction
 Indoor Air Quality (IAQ) refers to the air quality within and around buildings
and structures, especially as it relates to the health and comfort of building
occupants.(USEPA,2016)
 In recent times indoor air quality has attracted the attention of policy makers
and researchers similar to that of external air pollution (Raja et al, 2009).
 People in urban areas spend about 90% of their time indoor, that is to say, 70%
in workplaces and 20% in their houses (Turkstat,2017 & WHO, 2000).

4.  In developing countries, Garments industry provide major environment for the
worker since they spend a considerable part of their time at industry for around
8-10 hours a day and 4050 hours a week (Gupta et al., 2010).
 Studies have proven that poor indoor air quality in an industry premise might
result in more illness, absenteeism and asthma attacks on workers
(Kamaruzzaman et al, 2013).
 Most common air pollutants in the urban environment are Sulfur dioxide,
Nitrogen dioxide, Carbon monoxide, Carbon dioxide and Suspended
particulate matter (SPM) (D'Amato, 1999)

5. Objectives of the Study
 To study the present status of indoor air quality of
different industries in Bangladesh.
 To compare the local industrial indoor air quality with
WHO standards.

6. Materials and Methods
Study Area
The study was conducted on different industries at
Gazipur, Narayanganj and Savar in Dhaka division.

7. Map of the Study Area

8. Data collection
Secondary data were collected from Envirocare International
Limited , Bangladesh . SPM, PM2.5, PM10, CO2 and CO were
measured in industrial building at every 30 min interval and SO2,
NO2 were measured at 4 hours interval between 9:00 AM to 5:00
PM for 5 days every week .

9. Data analysis
The collected data were arranged and tabulated . For the analysis of
data MS Excel and MS Word software were used. For the
presentation of data tables, graphs, charts and maps were used .

10. Methods of analysis
Parameters Methods
Suspended Particulate Matter(SPM) Gravimetric
Particulate Matter(PM2.5) Gravimetric
Particulate Matter(PM10)
Sulphur dioxide(SO2)
Nitrogen dioxide(NO2)
Carbon dioxide(CO2)
Carbon monoxide(CO)
Gravimetric
West Gaeke
Jacob and Hochhe
CO2 meter
CO meter

11. Results and Discussions

12. 0
50
100
150
200
250
µg/m3
Location
SPM
Standard Cutting Sewing Knitting packing

13. 0
10
20
30
40
50
60
70
80
90
µg/m3
Location
PM2.5
standard cutting Sewing Knitting finishing

14. 0
20
40
60
80
100
120
140
160
µg/m3
Location
PM10
Standard Cutting Sewing Knitting finishing Packing

15. 0
5
10
15
20
25
30
35
40
45
50µg/m3
Location
SO2
Standard Cutting Sewing Knitting finishing Packing

16. 0
5
10
15
20
25
30
35
40
µg/m3
Location
NO2
Standard Cutting Sewing Knitting finishing

17. CO and CO2
All the industries which we studied found each industries
CO and CO2 concentration are below the WHO standard
level.

18. 27%
23%
30%
20%
SPM
Cutting Sewing Knitting Finishing

19. 28%
22%
30%
20%
PM2.5
Cutting Sewing Knitting Finishing

20. 28%
23%
27%
22%
PM10
Cutting Sewing Knitting Finishing

21. 27%
25%
25%
23%
SO2
Cutting Sewing Knitting Finishing

22. 24%
24%29%
23%
NO2
Cutting Sewing Knitting Finishing

23. 26%
27%
20%
27%
CO
Cutting Sewing Knitting Finishing

24. 24%
25%25%
26%
CO2
Cutting Sewing Knitting Finishing

25. Conclusion & Recommendation
 The study concluded that the indoor SPM. PM2.5, PM10, SO2 and
NO2 concentrations of different industries were exceeded the
standard limits of WHO, though CO2 and CO concentrations were
within the standards
 In most cases we were ovserved higher values of air
pollutants(SPM, PM2.5, PM10, SO2, NO2, CO, CO2) in Knitting
and Cutting section and in some cases Finishing section
 . In our work we used secondary data and try to present the status
of indoor air quality in different industries.
 We are seeking attention to the concerned authorities, after seen
this report they should further investigation and take proper
action to reduce indoor air pollutants specially Knitting, Cutting
and Finishing sections.

26. The following recommendations are suggested:
 Regenerative Thermal Oxidizer (RTO) can be used to treat the
exhaust / air pollutants.
 Maintenance the equipment regularly and pollution reduction
devices should be used.
 Appropriate design of ventilation and Exhaust fan may remove
most of the indoor air

27. Thanks to all.