Updated:
Projects may exceed 500 µg/m³ in total VOCs (part 1b), so long as the following individual component VOCs do not exceed the limits listed in CDPH/EHLB/Standard Method V1.1, Table 4.1 (one half the Chronic Reference Exposure Levels (CREL) issued by Office of Environmental Health Hazard Assessment):

Projects located in areas where annual average ambient PM2.5 levels are 35 µg/m³ or higher may utilize one of the following alternative strategies to satisfy Part 2.
- Replace the PM2.5 level in part 2b with 25 µg/m³. Projects using this option are limited in WELL Certification level to Gold, no matter how many optimizations are achieved.
- Replace the PM2.5 level in part 2b and the PM10 level in part 2c with a level equal to 30% of the 24- or 48-hr average of ambient outdoor levels on the day(s) of Performance Verification. Projects using this option are limited in WELL Certification level to Silver, no matter how many optimizations are achieved.

To utilize the following AAP for Feature 02, projects must be either:
-Located in a jurisdiction where the provision of a smoking room is either mandated by ordinance, incentivized or subsidized by the government, or is a non-regulatory requirement.
OR
-Located in a jurisdiction where smoking is banned outdoors, except in designated areas. Such designated areas must be more than 50 m [164 ft] from all functional building entrances, and smoking ban must be enforced.
Projects may achieve Feature 02, Part 1 by providing smoking areas within the project boundary that meet the following requirements:
1. Clearly designated as a smoking area.
2. Independently ventilated and negatively pressurized to prevent smoke from escaping, as per either ASHRAE 62.1-2013, Section 5.17 or LEED NC 2009 IEQ prerequisite Environmental Tobacco Smoking (ETS) Control, Option 2 Case 1 Non-Residential Projects.
3. Uses doors that are equipped with self-closing mechanisms on all entrances.
4. Constructed of materials and furnishings with low absorptive and non-porous characteristics.
5. Does not allow persons under the age of 18 to enter.
6. Contains prominently-displayed smoking cessation and health education signage and does not contain entertainment amenities.
7. When cleaned, cleaning staff are provided with P100 respirator masks.
8. If the smoking area is repurposed, all materials within the space must be discarded.

During performance verification, one of the sampling points for Feature 01 will be 2–5 m [6.6–16.4 ft] meters from the door to the smoking room and the door will be opened at least once every ten minutes during the testing period.

For Feature 02, Part 2, project may have outdoor smoking areas (e.g., on a roof or patio), provided that these areas are at least 8 m [26 ft] from outdoor air intakes and operable windows. There must be at least two regularly closed doors (or one revolving door) between the smoking area and any regularly occupied interior space for any entries within 8 m [26 ft] of outdoor smoking area. Project must include an identical (or superior) outdoor area where smoking is banned at least 20 m [66 ft] from any other outdoor area where smoking is allowed.

A project using this AAP is limited to Silver level certification, unless it:
- Achieves Feature 95: Stress and addiction treatment, in which case it can achieve Gold.

In addition to original documentation, an architectural drawing must be provided which indicates location, entrances, and wall construction of smoking area. Furthermore, the MEP engineer must provide a Letter of Assurance that the ventilation and pressurization requirements are met. Proper signage must be posted at the entrance to the smoking area and is subject to a spot check during performance review.

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To deter smoking, minimize occupant exposure to second hand smoke, and reduce smoke pollution.'

The Article R4222-6 of the French Work Code (Code du Travail) has been deemed acceptable for ASHRAE 62.1-2013 of Part 1 for France.
Note that this equivalency only applies for office buildings.

Multifamily residential projects may achieve Feature 03, Part 4 by ventilating lobbies and corridors via infiltration from pressurized dwelling units rather than dedicated supply air. Infiltration into these spaces must meet or exceed 0.3 L/s/m².
A professional narrative must also be provided which indicates pressurization levels in dwelling units and demonstrates sufficient infiltration into corrdidors and/or lobbies.

Where projects are restricted from implementing a demand-controlled ventilation system or are unable to retrofit the existing ventilation system to be demand-controlled, the requirements of Feature 03 Part 2 may be met through the following conditions for outdoor air supply rate, whichever is more stringent:
1. Exceed the ventilation rates set in ASHRAE 62.1-2013 (Ventilation Rate Procedure or IAQ Procedure) by 40%. Note that if this feature part applies to more than 50% of the total floor area at the project site, projects are not eligible to receive points for Feature 15 Part 1a.
2. Provide a ventilation supply rate of 12 L/s (25 CFM) per person or higher.

ASHRAE Standard 62.1-2007 has not been accepted as an equivalent for the requirements of Feature 03 Part 1 and 3. Note that the ventilation requirements for all space types are not equivalent between ASHRAE Standard 62.1 versions 2007 and 2013. Therefore, these reference standards cannot be considered equivalent for all projects.

CIBSE Guide A has been accepted as an alternative for the requirements in ASHRAE 62.1 2013 for Feature 3 Part 1

For Part 2a, add: "(measured at 1.2-1.8 m [4-6 ft] above the floor)" after "800 ppm" at the end of the sentence

EN 13779, section A. 15. 2, Table A.10 may be used to comply with Feature 03, Part 2. Note, projects must adhere to Indoor Air Category IDA 1 or 2.

CEN Standards EN 15251:2007 and EN 16798-3:2017 may be used in lieu of ASHRAE 62.1-2013 for Feature 03, Part 1. ​​​​
The requirements of CEN Standard EN 15251-2007 must be met AND the performance requirements of CEN Standard EN 16798-3:2017 related to ventilation and room conditioning systems must be met (excluding section 7.3, Thermal Environment; section 7.6, Acoustic Environment; section A.16; and section A.17).

Projects must meet Category I or II as described in the standards.

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To ensure adequate ventilation and high indoor air quality.'

Under Part 2, after “For all spaces” insert the following: “46.5 m² [500 ft²] or larger”

Singapore SS 553 (2016) CP Standard has not been accepted as an equivalent for ASHRAE 62.1-2013 of Feature 03. Note the building/occupancy types indicated in the Outdoor Air Supply Requirements (Table 1) is not sufficient to cover all buildings and space types for all projects in Singapore.

For Part 4a, remove: "(Ventilation Rate Procedure or IAQ Procedure) for residential buildings of 3 or fewer floors". Add: "(or more recent version) for dwelling units"

Remove: "c. Projects comply with all requirements set in the Natural Ventilation Procedure…the previous year."

The eco-INSTITUT method and thresholds for VOC emissions have been accepted as equivalents for the ANSI/BIFMA e3-2011 Standard sections 7.6.1 or 7.6.2, tested in accordance with ANSI/BIFMA Standard Method M7.1-2011 of Feature 4 Part 5.

A 4 Ticks (Leader) certification rating by the Singapore Green Building Product (SGBP) certification scheme has been accepted as an equivalent for the California Department of Public Health (CDPH) Standard Method v1.1-2010 of Feature 4 Part 3.  

STANDARD 100 by OEKO-TEX® has not been accepted as an alternative for the requirements of Feature 4 Part 5.

The "Desirable Requirements" denomination in the Recommended Green Specifications published by the Hong Kong Environmental Protection Department (HKEPD) has been accepted as an alternative for the requirements of Feature 04 Parts 3, 4 and 5.
Note that the HKEPD thresholds for Formaldehyde and VOC are higher than WELL thresholds.
This Equivalency may only be used for projects in Hong Kong.

For Part 5a, remove: "and". Add: "or"

The Good Environmental Choice Australia (GECA) Adhesives, Fillers and Sealants (AFSv4.0i-2014) has been accepted as an alternative for the requirements of Feature 04 Part 2a.

The Good Environmental Choice Australia (GECA) Building Insulation Materials (BIMv2.0-2017) has been accepted as an alternative for the requirements of Feature 04 Part 4.

GreenGuard Gold has been accepted as an equivalent for California Department of Public Health (CDPH) Standard Method v1.1-2010 of Feature 04 Part 3 (or later).

The IS:13745-1993 testing method has not been accepted as an alternative for the requirements of CDPH Standard Method v1.1-2010 (or later) of Feature 04 Part 5 for projects in India. E1 class (EN 13986:2004) is an accepted alternative for the requirements of Feature 04 Part 5 for furniture substrates, although only for products aligned with protocols accepted under EN 13986:2004 for Europe.

Formaldehyde E1 class has been accepted as an alternative to the requirements of Feature 04, Part 5 for furniture substrates.
This Equivalency may only be used for projects in Europe.

CertiPUR has been accepted as an alternative for the requirements of Feature 04, Part 5. Note this only applies to polyurethane foam used in bedding and upholstered furniture. This Equivalency does not cover any other furniture or furnishing components except for the polyurethane foam.
This Equivalency may only be used for projects in Europe.

Blue Angel (Blauer Engel) is approved as an acceptable equivalent to the requirements of Feature 04, Part 5 for Europe.

European Union Paints Directive 2004/42/EC has been accepted as an alternative for the requirements of Feature 04, Part 1 for Europe. Please note that the European Union Paints Directive 2004/42/EC is the compliant performance standard for paints and varnishes listed within BREEAM UK New Construction: Hea 02 Indoor Air Quality.

EU Ecolabel for wooden floor coverings (2010 version) has been accepted as an alternative for the requirements of CDPH Standard Method v1.1-2010 (or later) of Feature 04 Part 3 for Europe.

In part description, add: "interior" after "newly installed"

TÜV Rheinland Green Product Mark Furniture criteria, 2PfG E1992, has been accepted as an alternative for the requirements of Feature 4 Part 5.

The GB 18580-2001 Indoor Decorating and Refurbishing Materials - Limit of Formaldehyde Emission of Wood-based Panels and Finishing Products has not been accepted as an alternative for the requirements of Feature 4 Part 3, 4 and 5. Note the proposed testing method standard does not include methods for testing VOCs other than formaldehyde.

M1 (ISO 16000) is approved as an acceptable equivalent to the requirements of Feature 4 VOC Reduction Part 1, 2, 3, 4 and 5.

CRI Green Label Plus is approved as an acceptable equivalent to the requirements specified in the CDPH Standard Method v1.1-2010 (or later) for Feature 4 Part 2 and 3.

AgBB is approved as an acceptable equivalent to the requirements of Feature 4 VOC Reduction Part 1, 2, 3, 4 and 5 for Europe.

The REACH standard has not been accepted as an equivalent to the CDPH Standard Method v1.1-2010 (or later) guidelines for Feature 04 Part 5. Note that the VOC limit thresholds specified in CDPH Standard Method v1.1-2010 (or later) guidelines must be met. The VOC limit thresholds for Substances of Very High Concern (SVHC) listed in REACH are not acceptable.

EN 13964:2014 emission testing method has been accepted as an alternative for the requirements of Feature 4, Part 4 for suspended ceilings. Ceilings with heating or cooling properties and walls must meet limits set by the California Department of Public Health Standard Method v1.1-2010 (or later). Formaldehyde emission should be measured in accordance with EN 717-1:2004.

Global GreenTag has been approved as an acceptable equivalent to the requirements for Feature 04 Part 1, 2, 3, 4 and 5.

IS 101.2.2.1986 and IS 101.2.1.1988 are acceptable equivalent testing method standards in order to measure in accordance with the VOC content threshold limits specified in SCAQMD Rule 1168 for Part 2a.

Indoor Air Comfort has not been accepted as an alternative for meeting the requirements of Feature 04 Parts 1, 2, 3, and 4.

The GUT carpet standard has been accepted for Feature 04 Part 3.

Note that products are subject to these thresholds:
Termination criteria 3 days after loading: 250 µg/m³ TVOC, 10 µg/m³ Formaldehyde.
Desired values 28 days after loading: 100 µg/m³ TVOC, 4 µg/m³ Formaldehyde.
This equivalency may only be used for projects in Europe.

For Part 2a, add: "for VOC content", after "South Coast Air Quality Management District (SCAQMD) Rule 1168"

Indoor Air Comfort Gold has been accepted as an alternative for the requirements of Feature 04 Parts 1, 2, 3, 4 and 5.

Remove: "July 1, 2005 for VOC content". Add: "Volatile organic compound (VOC) limits correspond to an effective date of July 1, 2005 and rule amendment date of January 7, 2005."

The Finnish M1 Label for non-upholstered furniture has been accepted as an equivalent for the ANSI/BIFMA e3-2011 Standard and M7.1-2011 Method of Part 5 for Europe

Previously published as an AAP:
Products and materials that have an A or A+ class rating under the French legislation on VOC emissions meet the requirements of Parts 1, 2, 3, and 4.

Greenstuf has been accepted as an equivalent for CDPH Standard Method v1.1-2010 of Feature 4 Part 4.

CalGreen 2013 Title 24, Part 11, California Green Building code has been approved as an equivalent for F04, Parts 1 and 2. For Part 3, projects are required to meet 100% of the resilient flooring requirements according to CalGreen 2013 Title 24 in order to fully comply with WELL requirements.