In Singapore, maintaining superior indoor air quality (IAQ) is vital for occupant health, productivity, and well-being in buildings such as offices, schools, and healthcare facilities. Poor IAQ, driven by pollutants like formaldehyde, total volatile organic compounds (TVOC), and particulate matter (PM2.5), can lead to health issues such as respiratory problems, allergies, and fatigue. Certifications like WELL v2 and LEED v4.1 set rigorous IAQ standards to ensure healthy indoor environments, enhancing building value and occupant satisfaction. At Envirex Pte Ltd, we provide comprehensive IAQ monitoring services to help you meet WELL v2 and LEED v4.1 requirements, ensuring compliance with Singapore’s National Environment Agency (NEA) guidelines where applicable. In this guide, we’ll explore the importance of IAQ monitoring, how our services align with WELL v2 and LEED v4.1 standards, and how Envirex can support your certification journey.

Why IAQ Monitoring Is Essential for WELL v2 and LEED v4.1 Certification
Indoor air quality directly impacts occupant health, comfort, and productivity. WELL v2, developed by the International WELL Building Institute (IWBI), emphasizes occupant well-being through its Air Concept, while LEED v4.1, established by the U.S. Green Building Council (USGBC), focuses on Indoor Environmental Quality (IEQ) as a core category for green building certification. Both standards set stringent IAQ requirements to ensure buildings provide a healthy environment. IAQ monitoring for these certifications offers:
- WELL v2 Compliance: Meet Air Concept features like A01 (Fundamental Air Quality) and A05 (Enhanced Air Quality) to earn points toward certification levels (Bronze to Platinum).
- LEED v4.1 Credits: Achieve IEQ credits by monitoring and maintaining IAQ parameters, contributing up to 20 points toward certification.
- Occupant Health: Reduce health risks from pollutants like formaldehyde, TVOC, and PM2.5, preventing issues like Sick Building Syndrome (SBS).
- Regulatory Alignment: Align with NEA guidelines for ventilation and IAQ, ensuring compliance in Singapore’s tropical climate.
At Envirex Pte Ltd, we help you achieve these certifications with a service that ensures precision, compliance, and occupant well-being.
Applications of Envirex’s IAQ Monitoring Service for WELL v2 and LEED v4.1
Our service is ideal for:
- Commercial Buildings: Monitor IAQ in offices to meet WELL v2 and LEED v4.1 standards, enhancing employee productivity and well-being.
- Educational Institutions: Ensure a healthy learning environment in schools by complying with IAQ requirements for certification.
- Healthcare Facilities: Maintain stringent IAQ standards in hospitals to protect patients and staff, aligning with WELL v2’s focus on vulnerable populations.
- Hotels and Residential Spaces: Improve guest and resident comfort by achieving certification through superior IAQ management.
Standards Compliance
Our service adheres to WELL v2 and LEED v4.1 requirements, as well as Singapore Standards and NEA guidelines:
- WELL v2 Air Concept: Complies with features like A01 (Fundamental Air Quality) and A05 (Enhanced Air Quality), covering pollutants such as formaldehyde, TVOC, and PM2.5.
- LEED v4.1 IEQ Category: Meets prerequisites and credits for IAQ performance, including testing for specific VOCs and TVOC levels.
- SS 554:2016 + A1:2021: Aligns with Singapore’s Code of Practice for Indoor Air Quality for Air-Conditioned Buildings.
- NEA Guidelines: Follows NEA’s recommendations for ventilation and IAQ improvement in buildings.
Key Features of Envirex’s IAQ Monitoring Service for WELL v2 and LEED v4.1
Our service is designed to help you achieve WELL v2 and LEED v4.1 certification by meeting their rigorous IAQ requirements:
- Comprehensive IAQ Parameter Testing for WELL v2 and LEED v4.1
We test for key IAQ parameters required by both standards, ensuring your building meets acceptable limits. Below are the parameters and thresholds we monitor, based on WELL v2 and LEED v4.1 requirements:
Table 1: WELL v2 IAQ Parameters and Thresholds (Feature A01 and A05)
S/No | Parameter | WELL v2 Threshold (A01/A05) |
---|---|---|
1 | PM2.5 | <15 µg/m³ |
2 | PM10 | <50 µg/m³ |
3 | Formaldehyde | <27 ppb |
4 | Total Volatile Organic Compounds (TVOC) | <500 µg/m³ |
5 | Carbon Monoxide (CO) | <9 ppm |
6 | Ozone | <51 ppb |
7 | Carbon Dioxide (CO₂) | <800 ppm (for A05 Enhanced) |
Table 2: LEED v4.1 Specific VOCs and Concentration Limits
LEED v4.1 requires testing for a shortened list of 12 VOCs with defined thresholds to achieve IEQ credits. The table below lists these VOCs and their concentration limits:
S/No | Contaminant | Concentration Limit (µg/m³) |
---|---|---|
1 | Formaldehyde | 20 µg/m³ (16 ppb) |
2 | Acetaldehyde | 140 µg/m³ |
3 | Benzene | 3 µg/m³ |
4 | Hexane (n-) | 7000 µg/m³ |
5 | Naphthalene | 9 µg/m³ |
6 | Phenol | 200 µg/m³ |
7 | Styrene | 900 µg/m³ |
8 | Tetrachloroethylene | 35 µg/m³ |
9 | Toluene | 300 µg/m³ |
10 | Vinyl acetate | 200 µg/m³ |
11 | Dichlorobenzene (1,4-) | 800 µg/m³ |
12 | Xylenes | 700 µg/m³ |
How to Get Started with Envirex’s IAQ Monitoring Service
Achieving WELL v2 and LEED v4.1 certification through superior IAQ is simple with Envirex Pte Ltd. Follow these steps:
- Consultation: Contact us to assess your building’s IAQ needs and certification goals.
- IAQ Testing: Our team will conduct on-site testing using advanced equipment to measure key parameters.
- Reporting and Recommendations: We’ll provide a detailed report with actionable recommendations to meet WELL v2 and LEED v4.1 standards.
Ready to achieve WELL v2 and LEED v4.1 certification? contact Envirex Pte Ltd – Your Dedicated IAQ Consultant Singapore.