Remove: "4 pCi/L". Add: "0.148 Bq/L [4 pCi/L]"

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.'

ASHRAE Standard 170-2008 has been accepted as an alternative to meet the requirements of Feature 3 - Ventilation Effectiveness, Part 1 - Ventilation Design for healthcare facilities.

Note that all spaces not covered in ASHRAE 170-2008 must follow ventilation rates described in ASHRAE 62.1-2010 or later.

UK Building Regulations Part F has been accepted as an equivalent for ASHRAE 62.2-2013 of Feature 03, Part 4a for supply air ventilation requirements.
Note that the extraction rates for kitchen and toilet exhaust must still meet the ASHRAE 62.2-2013 requirements.
This equivalency may only be used for projects in the United Kingdom.

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.

Singapore SS 553:2016 CP Standard has not been accepted as an equivalent for ASHRAE 62.1-2013 of Feature 03. SS 553 Table 1 does not address all applicable and expected space types within an office occupancy. Note also that all Equivalencies are precedent-setting meaning that review of potential equivalent standards or codes cannot be conducted on a project-specific basis. Equivalency proposals must address the variety of project and space types present in the original code or standard. Further, in some cases, the ventilation rates listed in SS 553 Table 1 appear to be less than the default ventilation rates listed in ASHRAE 62.1-2013 Table 6.2.2.1 for the same occupancy types.
Please note that it is acceptable for the project team to bring on another individual with experience using ASHRAE standards to verify design compliance and sign the LOA (e.g. as a peer review), if they wish and/or the engineer of record is unable to do so.

Under "Air Feature 3 Ventilation effectiveness, Part 3", remove: "Testing and Balancing Report". Add: "MEP or Contractor" under "Letters of Assurance"

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

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

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.

At the end of Part 1b, add "Quality Standards feature in the WELL Building Standard for at least 95% of all hours in the previous year."

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"

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 Good Environmental Choice Australia (GECA) Paints and Coatings PCv2.2iii-2012 has been accepted as an alternative for the requirements of Feature 04 Part 1.

Headspace GC/MS has not been accepted as an equivalent for the requirements of Feature 04 Part 4. The Headspace method does not test for all VOCs that are limited by CDPH v1.1 2010. Note that the Headspace GC/MS method does test for individual VOCs but does not test for as many VOCs as required by CDPH v1.1 2010, including formaldehyde.

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.

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.

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.

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

In part description, remove: "inside the waterproofing membrane". Add: "interior" after "newly installed"

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

US EPA Method 24 has been accepted as an alternative to the requirements of Feature 04 VOC Reduction, Part 2. Please note that the products must have VOC content below the allowable limits established in SCAQMD as outlined in Part 2a. This equivalency may be used only in India.

OEKO-TEX is approved as an acceptable equivalent to the requirements of Feature 4 Part 4.

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

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.

MAS Certified Green® has been accepted for Feature 04 Parts 1, 2, 3, 4 and 5.

VOC ETL class 2 and 3, VOC+ ETL Environmental and Formaldehyde-Free, has been accepted for Feature 04 Part 5.

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

The Blue Angel Label for 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:
Field and Laboratory Emission Cell (FLEC) emissions testing is approved as an emissions testing methodology only for furniture and furnishings that are made up of a uniform material and have flat testing surfaces on which the FLEC emissions testing methodology may be applied. For example, flat surfaced cabinetry that is made up of a uniform material may be tested using this methodology. However, chairs that are made from a variety of materials that lack flat surfaces may not be tested using this methodology. The emissions test must be administered by a third party investigator with no affiliation with the project. The associated costs are the responsibility of the project team. Additional tests performed in accordance with ISO 16000 methodology must be performed for total aldehydes and 4-Phenylcyclohexane and must meet the thresholds specified in the WELL Building Standard.

Add: "b. For furnishings, California Department of Public Health (CDPH) Standard Method v1.1-2010."

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.

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

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To minimize the effect of VOCs in building materials on indoor air quality.'