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Indoor Air Quality Monitoring Parameters
Apurva Chawre

Indoor Air Quality Monitoring Parameters

🌱 Last updated: May 29, 2025

Indoor air quality monitoring Parameters are pollutants which can have significant effect on human life in small changes in their concentration. There are numerous pollutants are present in our atmosphere but we track / Monitor only those parameters which are important for us.

Importance of IAQ

Indoor air quality (IAQ) has a direct impact on human health, productivity, and comfort. Poor air quality can cause respiratory problems, allergies, fatigue, and long-term illnesses. Monitoring key indoor air pollutants helps identify contamination sources and ensures a safe living and working environment.

Indoor air quality has recently started to gain importance. We almost spend 90% of our time indoors. Most of us also have got familiarized with the term ‘indoor air quality’, but for those to whom indoor air quality is new; it refers to the air quality in and around building and structures.

Indoor air quality is said to have an effect on the health and comfort of building occupants. Wondering how our indoor air can pose an effect on our health and comfort?

From VOCs to PM2.5 – find out which pollutants might be silently hurting your compliance.

The indoor air contains a number of gases and microorganisms. Any changes in levels of gases or microorganisms will result in an unhealthy indoor environment for occupant.

To ensure safety of occupants, we must maintain good indoor air quality. To maintain good indoor air quality we must firstly know the different parameters which might change our indoor air quality.

Indoor Air quality monitoring parameters - Perfect Pollucon Services

Indoor Air Quality Monitoring Parameters

Indoor air quality monitoring follows global standards to ensure safety and compliance. Some of the widely recognized guidelines include:

  • WHO (World Health Organization) Indoor Air Quality Guidelines
  • EPA (Environmental Protection Agency) IAQ Standards
  • National Ambient Air Quality Standards (NAAQS)
  • ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers) Standards
  • National Building Code (NBC) 2016 (India)

Various parameters are considered to determine Indoor air quality.

Perfect Pollucon Services Offers Indoor Air Quality Monitoring / Testing Services for Homes and Offices.

Some of the Indoor air quality monitoring parameters are;

Carbon dioxide (CO2)

CO2 is most commonly present gas which results from respiration process or combustion end products. High levels of CO2 may stimulate the respiratory centre to cause dizziness. Confusion, difficulty in breathing, etc.

To measure CO2 levels indoors you can use CO2 sensor instrument.

Recommended Level: Below 1000 ppm (ASHRAE Standards)

Temperature

Changes in temperature indoors results in massive discomfort to humans. To achieve good indoor air quality it becomes necessary to maintain thermal comfort. According to National Building Codes (2016), temperature should be maintained at 26°C ± 2. Temperature indoors can be measured using a temperature monitoring device like thermo hygrometer.

Optimum humidity: 40-70% for comfort and health

Relative humidity

Elevated humidity promotes growth of various bacteria and molds indoors. This results in high risks for allergies, fever and asthma. On the other hand low humidity may result in sore eyes and throat. Optimum humidity according to National Building Codes 2016 should be 40 to 70%. Maintaining optimum humidity will help achieve good indoor air quality.

Humidity - Indoor Air quality Monitoing Parameters - Perfect Pollucon Services
Humidity

Sulphur Dioxide (SO2)

One of the toxic gases which may be present indoor is SO2. This can have chronic and acute effects on humans. Usually exposure to SO2 may cause pulmonary disease, difficulty in breathing, asthma, etc. According to NBC (2016), permissible levels for SO2 is 80 µg/m3 and can be measured using SO2 meter or high volume sampler.

Nitrogen oxides (NOx)

Another toxic and inflammable gas similar to SO2 found indoors is NOx. The permissible limit according to NBC (2016) is 200 µg/m3. Prolonged exposure to high levels may cause damage to lungs and vision.

Nitrogen Dioxide - Indoor air quality monitoring Parameters - Perfect Pollucon Services

Effects: Long-term exposure leads to respiratory diseases

Particulate Matter (PM 2.5 and PM 10)

PM 2.5 and PM 10 are the most considered PM sizes while measuring the quality of indoor air. These two sized are known to cause respiratory tract disorders and impair vision. They can be measured using sensor based meters like Dusttrak. The permissible limits prescribed by NBC (2016) are 60µg/m3.

Permissible limits: PM2.5 = 60 µg/m³, PM10 = 100 µg/m³

Air Velocity

Air velocity is one of the most important parameter deciding indoor air quality. If ventilation rate is very low, it will result in low indoor air quality. There should be an air velocity rate of 1.2m/s (minimum).

Indoor Air Quality Testing Methods

To assess indoor air quality accurately, professionals use different monitoring methods:

  • Continuous Monitoring – Uses real-time IAQ sensors for ongoing pollutant tracking.
  • Passive Air Sampling – Collects air samples over time for laboratory analysis.
  • Active Air Sampling – Uses air pumps to collect pollutants in canisters for precise measurement.
  • Indoor Air Quality Testing Kits – DIY kits to measure CO₂, VOCs, and PM levels.

Other Indoor Air quality Monitoring Parameters

There are other parameters also which are considered while measuring indoor air quality and they are; Formaldehyde, Oxygen, Ozone, Ammonia, Volatile organic compounds (VOCs).

Read more about Ozone Monitoring Services

Continuous exposure to low Indoor air quality can result in ill health. To achieve healthy indoor environment, you can now very well test your indoor air.

Knowing the parameters and standards of indoor air quality will eventually give you a ‘Key’ to healthy indoor environment and healthy life!

How to Improve Indoor Air Quality

To maintain a healthy indoor environment, follow these steps:
✅ Improve ventilation by opening windows or using exhaust fans.
✅ Use air purifiers with HEPA filters for PM and VOC reduction.
✅ Choose low-VOC paints and cleaning products.
✅ Maintain humidity between 40-70% to prevent mold growth.
✅ Get professional IAQ assessments for detailed analysis.

Continuous exposure to poor indoor air quality can cause serious health issues. By monitoring CO₂, VOCs, PM, and humidity levels, you can ensure a safer and healthier indoor environment.

If you are looking for professional indoor air quality testing, Perfect Pollucon Services provides certified IAQ assessments for homes and offices. Contact us today to test and improve your indoor air quality!

Source1

Source2

What is an air quality assessment?

An air quality assessment evaluates indoor and outdoor air pollutants using monitoring equipment to ensure health and safety compliance.

How do you measure indoor air quality?

Indoor air quality is measured using CO₂ sensors, VOC detectors, particulate matter monitors, and humidity meters.

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Sick Building Syndrome Testing
Noise Level Measurement Procedure

2 thought on Indoor Air Quality Monitoring Parameters

  1. Vijay says:
    at

    We are located in bangalore one of our customer needs their commercial site to be done with air quality test reports for 2 times that is one before cleaning process and another after cleaning process completed.
    Kindly revert back to mentioned mail id with details if you can support in bangalore.

Comments are closed.


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