Indoor Air Quality Monitoring & Testing

Indoor Air Quality (IAQ) Monitoring or Testing is an essential process to determine the level of contaminants present in indoor air which can affect productivity & well-being of occupants. Good and healthy Air Quality at the workplace can increase worker’s comfort, productivity and well-being. We check indoor air by using Indoor air quality equipment for various harmful parameters for Homes and Industries. Regular indoor air quality testing can help to identify issues with air quality. Thousands of man-days are lost every year because of sickness due to poor Indoor air quality (IAQ).

Indoor Air Quality Testing Services

Our Company offers Indoor air quality (IAQ) Testing or Monitoring services for residential and commercial buildings. We are certified to test / inspect parameters Temperature, Humidity, carbon monoxide, contamination by microbes, particulates and volatile organic compounds etc. For Homes and offices.

Indoor air quality is a growing concern & it directly affects human health. Gases like Carbon Monoxide, Contamination by microbes, Particulate or Volatile compounds diversely affect IAQ.

In India 80% of people spend their time indoors

So, air quality is a high priority for employers, building owners to provide a safe work environment for employees.

Indoor Air quality can be affected by gases, particulate matters, bacteria, etc and Its quality can be improved by using filters, controlling source, proper ventilation.

Indoor air quality for households can be improved by cleaning carpets, It also depends on the number of members in family, pets, smokers etc.

Determination of Indoor Air Quality involves processes air sampling, testing and analysis of the collected sample for various parameters. A major source of indoor air pollution is burning of wood, dung, charcoal for cooking purpose in households.

Indoor Air quality denotes the quality of air inside buildings as represented by humidity, temperature, air pollutants conditions which may affect comfort, health and performance of occupiers.


Read More about Fugitive Emission Monitoring & Testing


41F. PERMISSIBLE LIMITS OF EXPOSURE OF CHEMICAL AND TOXIC SUBSTANCES.

As per Factories Act Work Room air quality given:

(1) The maximum permissible threshold limits of exposure of chemical and toxic substances in manufacturing processes (whether hazardous or otherwise) in any factory shall be of the value indicated in the Second Schedule.

(2) The Central Government may, at any time, for the purpose of giving effect to any scientific proof obtained from specialized

institutions or experts in the field, by notification in the Official Gazette, make suitable changes in the said Schedule.

SCHEDULE. II PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN WORK ENVIRONMENT.

THE SECOND SCHEDULE [See section 41F]

PERMISSIBLE LEVELS OF CERTAIN CHEMICAL SUBSTANCES IN WORK ENVIRONMENT


Sl. No. Substance Permissible limits of exposure
    Time-Weighted
average
concentration
(TWA) 8 hr
(TWA) Short-term
exposure
limits (15 min.)
(STEL)
    ppm mg/m3 ppm mg/m3
1 2 3 4 5 6
1 Acetaldehyde 100 180 150 270
2 Acetic Acid 10 25 15 37
3 Acetone 750 1780 1000 2375
4 Acrolein 01 0.25 0.3 0.8
5 Acrylonitrile-skin (S.C) 2 4.5 - -
6 Aldrin-skin - 0.25 - -
7 Allyl Chloride 1 3 2 6
8 Ammonia 0.25 18 35 27
9 Aniline-skin 2 10 - -
10 Anisidine (O.P.isomers)-skin 0.1 0.5 - -
11 Arsenic & Soluble compounds (as As) - 0.2 - -
12 Benzene (S.C) 10 30 - -
13 Beryllium & Compounds (as Be) (S.C) - 0.002 - -
14 Boron trifluoride C 1 3 - -
15 Bromine 0.1 0.7 0.3 2
16 Butane 800 1900 - -
17 2-Butanone (Methyle ethyle Ketone MEK) 200 590 300 885
18 N-Butyl acetate 150 710 200 950
19 N-Butyl alcohol-skin-C 50 150 - -
20 Sce/tert, Butyl acetate 200 950 - -
21 Butyl Mercaptan 0.5 1.5 - -
22 Cadmium-dust and salts (as Cd) - 0.05 - -
23 Calcium oxide - 2 - -
24 Carbaryl (Sevin) - 5 - -
25 Carbofuran (Furadan) - 0.1 - -
26 Carbon disulphide-skin 10 30 - -
27 Carbon monoxide 50 55 400 440
28 Carbon tetrachloride-skin (S.C.) 5 30 - -
29 Chlordane-skin - 0.5 - 2
30 Chlorine 1 3 3 9
31 Chlorobenzene (monochlorobenzene) 75 350 - -
32 Chloroform (S.C.) 10 50 - -
33 bis-(Chloromethyl) ether (H.C.) 0.001 0.005 - -
34 Chromic acid and chromates (as Cr) (Water soluble) - 0.05 - -
35 Chromous Salts (as Cr) - 0.5 - -
36 Copper fume - 0.2 - -
37 Cotton dust, raw - 0.2 - -
38 Cresoal, all isomers-skin 5 22 - -
39 Cyanides (as Cn)-skin - 5 - -
40 Cyanogen 10 20 - -
41 DDT (Dichlorodiphenyl Trichloroethane) - 1 - -
42 Demeton-skin 0.01 0.1 - -
43 Diazinon-skin - 0.1 - -
44 Dibutyl Phythalate - 5 - -
45 Dichlorous (DDVP)-skin - 1 - -
46 Dieldrin-skin - 0.25 - -
47 Dinitrobenzene (all isomers)-skin 0.15 1 - -
48 Dinitrotoluene-skin - 1.5 - -
49 Diphenyl (Biphenyl) 0.2 1.5 - -
50 Endosulfan (Thiodan)- skin - 0.1 - -
51 Endrin-skin - 0.1 - -
52 Ethyl acetate 400 1400 - -
53 Ethyl alcohol 1000 1900 - -
54 Ethylamin 10 18 - -
55 Fluorides (as F) - 2.5 - -
56 Fluorine 1 2 2 4
57 Formaldehyde (S.C.) 1.0 1.5 2 3
58 Formic Acid 5 9 - -
59 Gasoline 300 900 500 1500
60 Hydrazine-skin (S.C.) 0.1 0.1 - -
61 Hydrogen Chloride-C 5 7
62 Hydrogen Cyanide skin-C 10 10 - -
63 Hydrogen Fluoride (as F)-C 3 2.5 - -
64 Hydrogen Peroxide 1 1.5 - -
65 Hydrogen Sulphide 10 14 15 21
66 Iodine-C 0.1 1 - -
67 Iron Oxide Fume (F0203) (as Fe) - 5 - -
68 Isoamyl acetate 100 525 - -
69 Isoamyl alcohol 100 360 125 450
70 Isobutyl alcohol 50 150 - -
71 Lead, inorg, dusts, dusts and fumes (as Pb) - 0.15 - -
72 Lindane-skin - 0.5 - -
73 Malathion-skin - 10 - -
74 Manganese dust and compounds (as (Mn)-C - 5 - -
75 Manganese Fume (as Mn) - 1 - 3
76 Mercury (as Hg)-skin
(i) Alkyl compounds - 0.01 - 0.03
(ii) All forms except alkyl vapour - 0.05 - -
(iii) Alkyl and inorganic compounds - 0.1 - -
77 Methyl alcohol (Methanol)-skin 200 260 250 310
78 Methyl cellosolve (2-methoxyethanol)-skin 5 16 - -
79 Methyl isobutyl Ketone 50 205 75 300
80 Methyl Isocyanate-skin 0.02 0.05 - -
81 Naphthalene 10 50 15 75
82 Nickel carbonyl (as Ni) 0.05 0.35 - -
83 Nitric acid 2 5 4 10
84 Nitric Oxide 25 30 - -
85 Nitrobenzene-skin 1 5 - -
86 Nitrogen dioxide 3 6 5 10
87 Oil mist mineral - 5 - 10
88 Ozone 0.1 0.2 0.3 0.6
89 Parathion-skin - 0.1 - -
90 Phenol-skin 5 19 - -
91 Phorate (Thimet)-skin - 0.05 0.2 -
92 Phosgene (Carbonyl Chloride) 0.1 0.4 - -
93 Phosphine 0.3 0.4 1 1
94 Phosphoric acid - 1 - 3
95 Phosphorus (yellow) - 0.1 - -
96 Phosphorus penta- chloride 0.1 1 - -
97 Phosphorus trichloride 0.2 1.5 0.5 3
98 Picric acid-skin - 0.1 - 0.3
99 Pyridine 5 15 - -
100 Silans (silicon tetrahydride) 5 7 - -
101 Sodium hydroxide-C - 2 - -
102 Styrene, monomer (phanylethlene) 50 215 100 425
103 Sulphur dioxide 2 5 5 10
104 Sulphur hexafluoride 1000 6000 - -
105 Sulphuric acid - 1 - -
106 Tetraethyl lead (as Pb) – Skin - 0.1 - -
107 Toluene (Toluol) 100 375 150 560
108 O-Toluidine-skin (S.C.) 2 9 - -
109 Tributylphosohate 0.2 2.5 - -
110 Trichloroethylene 50 270 200 1080
111 Uranium natural (as U) - 0.2 - 0.6
112 Vinyl Chloride (H.C.) 5 10 - -
113 Welding fumes - 5 - -
114 Xylene (O-m-P-isomers) 100 435 150 655
115 Zinc oxide        
(i) Fume - 5.0 - 10
(ii) Dust (Total dust) - 10.00 - -
116 Zirconium compounds (as Zr) - 5 - 10

Indoor Air Quality Testing Locations

The ideal sampling site depends on the purpose of sampling or monitoring. If the objective is to monitor indoor environmental quality in offices then location is preferred in office. If monitoring sites are representative of the monitoring site then the investigator must ensure that site is accurately representative of the environmental monitoring site.

More than one point in indoor air quality testing / Inspecting is preferred because air quality is not evenly distributed.

Indoor Air Quality Monitoring Time

The concentration of contaminants in indoor air is related to humidity, temperature, human activities, therefore selecting time can be very influential in results. It is recommended that two hours of indoor air quality monitoring is best practice i.e. One hour in the morning and one hour in the evening.

24 hours /full day monitoring can be a better option when particular contaminants need to monitor.

Indoor Air Quality Monitoring & Testing Duration

The sampling duration of the site depends on the investigation of the acute effects of chronic effects on health. Monitoring duration can vary from 15 mins to several days depends on the type of data or sample required. The longer survey can give a more accurate and clearer picture of indoor air quality.

Number of Samples in Indoor Air Quality Testing

The number of samples or data points are selected prior to the indoor air sampling process based on the area and severity of pollutants. Normally in any event at first three samples are taken at the monitoring site and If the range of these exceeds more than 5% to 15% then additional samples or points can be monitored.

According to EPA (Environmental protection agency) sampling area of 25,000 sq. ft. on continuous floor meets the requirement of one sampling point. It is required to collect air samples for consecutive three days and average the results of each three days cycle for each air sampling zone.

Indoor Air Quality Testing Equipment

The equipment used in indoor air monitoring and the testing process must be regularly calibrated as per pollution control boards standards.

Due to the increase in time spent indoor, monitoring its quality has become a necessity. In addition, It is very important to maintain temperature, humidity, ventilation and draft of a building. Indoor quality monitoring instruments helps to understand their range and based on collected data necessary actions can be taken to avoid health issues.

Building and Ventilation Characterization

Size, the material used in construction, location, age, type, people and their activities information needs to be taken in sampling or monitoring process.

Additionslly, ventilation parameters like airflow, Volume of air and Air velocity also need to be monitored.

Our Company monitor Indoor air quality in places such as new offices, Print rooms, Processing or manufacturing plants, clean rooms and workshops etc.

Commercial Indoor Air Quality Testing

In Commercial Indoor Air Quality Testing Service we test indoor air for

  • Chemical components like VOCs, formaldehyde, pesticides, SO2, CO2, CO, NOx etc.
  • Biological Pollutants – mould, bacteria, fungus, allergens
  • Particulate Matter- PM2.5, PM10, dust, etc.
  • Moisture, Humidity
  • Temperature

Residential Indoor Air Quality Testing

In Residential Indoor Air Quality Testing Service we test the air for following pollutants in home interiors:

  • Chemical emissions (SO2, CO2, CO, NOx etc.)
  • Moisture and Humidity
  • Biological contaminants e.g mould, Bacteria, fungus, allergens
  • Temperature
  • Air Velocity i.e.e Ventilation

Indoor Air Quality Assessment Report

We provide Indoor Air Quality Assessment Report after analyzing samples in our laboratory and provide analysis report as per below format.

Below report contains information about Client name, Sampling location, date, etc. It also includes results of Physical parameters (like Temperature, Humidity, etc.) and Chemical Parameters (like Sulphur dioxide, Nitrogen Dioxide, etc.) post-analysis done in Laboratory.