Updated:
Projects may exceed 500 µg/m³ in total VOCs (part 1c), 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.

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.'

For Part 4b, remove: "(Ventilation Rate Procedure or IAQ Procedure) for residential buildings of more than 3 floors above grade". Add: "for common areas and other spaces apart from dwelling units"

For Part 2b, add: "(measured at 1.2-1.8 m [4-6 ft] above the floor)" after "below 800 ppm" and add: "maximum" after "at"

In Part 3a, change "After substantial completion and prior to occupancy, the HVAC system undergoes testing and balancing" to "After substantial completion and prior to occupancy, the HVAC system has (within the last 5 years), or is scheduled to, undergo testing and balancing."

AS 1668.2 may be used in lieu of ASHRAE 62.1 for Feature 3, Part 1: Ventilation Design. Note that all projects that wish to comply with AS 1668.2 must assume a minimum density of 16 m² per person.

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."

M1 (EN-717-1:2004) is approved as an acceptable equivalent to the requirements of Feature 4 VOC Reduction Part 5.

Blue Angel is approved as an acceptable equivalent to the requirements of Feature 4 VOC Reduction Part 1 and 2. Note, projects must adhere to the minimum formaldehyde requirement specified in the CDPH Standard Method v1.1-2010 for VOC emissions.

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

The REACH standard has not been accepted as an equivalent to the CDPH Standard Method v1.1-2010 guidelines for Feature 04 Part 5. Note that the VOC limit thresholds specified in CDPH Standard Method v1.1-2010 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. 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 Gold has been approved for Feature 04 - Part 1, 2, 3 and 4. However, indoor air comfort is not an accepted label for meeting WELL Feature 04 Part 1, 2, 3 and 4.

BREEAM-NL New Construction 2014, Hea 09 - Volatile Organic Compounds, is an approved alternative to BREEAM UK New Construction 2014 Hea 02 - Indoor Air Quality to meet WELL Feature 04 Parts 1-3.

GUT has been accepted for Feature 04 Part 3.

The GUT standard was created by the European carpet industry, and aims ""to improve continuously all environmental and consumer protection aspects throughout the life cycle of a textile floor covering (from production to installation, to use phase and recycling"".

This standard is only applicable to Part 3, and thresholds are as follows:

Termination criteria 3 days after loading:
TVOC: 250 µg/m³
Formaldehyde: 10 µg/m³

Desired values 28 days after loading:
TVOC: 100 µg/m³
Formaldehyde: 4 µg/m³

Exemplary level emission criteria for BREEAM International New Construction 2016 scheme has been accepted as an equivalent standard to the California Department of Public Health (CDPH) Standard method v1.1-2010 as specified in Part 4a of this feature. The thresholds are as follows:
Formaldehyde limit of 10 µg/m³
TVOC limits of ≤ 0.3 mg/m³
The insulation materials may be tested using one of the following methodologies:
ISO 16000-9
CEN/TS 16516
CDPH Standard Method v1.1

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."

Previously published as an AAP:
The following referenced standards may be used in lieu of ANSI/BIFMA e3-2011 Furniture Sustainability Standard Section 7.6.1 and 7.6.2, testing in accordance with ANSI/BIFMA Standard Method M7.1-2011:
- the Finnish M1 label for non-upholstered furniture
- the Blue Angel label for upholstered furniture
If these standards are used, the furniture must also be separately tested for 4-phenylcyclohexane and total aldehydes and held to the same limits specified in ANSI/BIFMA e3-2011 section 7.6.1 and 7.6.2

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.

Updated:
LEED v4 EQc Low-emitting materials credit is deemed equivalent for Part 1. Please note that the project must adhere to the ""Additional VOC content requirements for wet-applied products"" section (found in LEED v4). Additionally, all newly applied paints and coatings must be in compliance.
BREEAM UK NC/RFO 2014, INC. 2016 and IRFO 2015 Hea 02: Indoor air quality - Volatile organic compound (VOC) emission levels (products) credit is deemed equivalent for Part 1. Please note the project must adhere to the Volatile organic compound (VOC) emission levels for products (found in Table 18 in the BREEAM UK New Construction 2014, Table 20 in the UK RFO 2014, Table 17 and 18 in the INC 2016). Additionally, all newly applied paints and coatings must be in compliance.

LEED v4 EQc Low-emitting materials credit is deemed equivalent for Part 2. Please note that the project must adhere to the ""Additional VOC content requirements for wet-applied products"" section (found in LEED v4). Additionally, all newly applied adhesives and sealants must be in compliance.
BREEAM UK NC/RFO 2014, INC 2016 and IRFO 2015 Hea 02: Indoor air quality - Volatile organic compound (VOC) emission levels (products)credit is deemed equivalent for Part 2. Please note the project must adhere to the Volatile organic compound (VOC) emission levels for products (found in Table 18 in the BREEAM UK New Construction 2014, Table 20 in the UK RFO 2014, Table 17 and 18 in the INC 2016). Additionally, all newly applied adhesives and sealants must be in compliance.

LEED v4 EQc Low-emitting materials credit is deemed equivalent for Part 3. Please note that the project must adhere to the ""General emissions evaluation"" section (found in LEED v4). Additionally, all newly installed flooring must be in compliance.
BREEAM UK NC/RFO 2014, INC 2016 and IRFO 2015 Hea 02: Indoor air quality - Volatile organic compound (VOC) emission levels (products) credit is deemed equivalent for Part 3. Please note the project must adhere to the Volatile organic compound (VOC) emission levels for products (found in Table 18 in the BREEAM UK New Construction 2014, Table 20 in the UK RFO 2014, Table 17 and 18 in the INC 2016). Additionally, all newly installed flooring must be in compliance.

LEED v4 EQc Low-emitting materials credit is deemed equivalent for Part 4. Please note that the project must adhere to the ""General emissions evaluation"" section (found in LEED v4). Additionally, all newly installed insulation must be in compliance.

LEED v4 EQc Low-emitting material credit is deemed equivalent for Part 5. Please note that the project must adhere to the ""Furniture evaluation"" section (found in LEED v4). Additionally, 95% (by cost) of all newly purchased furniture and furnishing must be in compliance.

Note BREEAM equivalency is only applicable for Feature 4 Parts 1-3.

Indoor Advantage Gold has been approved as an acceptable alternative for F04, Parts 1, 2, 4, and 5.

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.

Floorscore has been approved as an equivalent standard F04, Parts 2 and 3.

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.'

AFRDI Green Tick Furniture is compliant with Feature 4, Part 5.
It should be noted that GECA's allowable emission levels exceed those required in the ANSI/BIFMA e3-2011 Furniture Sustainability Standard, and GECA does not address the VOC emission concentration thresholds required by the ANSI/BIFMA e3-2011 Furniture Sustainability Standard. However, GECA is currently deemed a best in class within its market at this time.

Change “The VOC content of all newly installed thermal and acoustic insulation in ceilings and walls…” to “The VOC content of all newly installed thermal and acoustic insulation inside the waterproofing membrane…”

Under Part 2c, delete "VOC control" and replace with "VOC content".

Add Contractor Letters of Assurance as required documentation.

The level© certification program may be used in lieu of ANSI/BIFMA e3-2011 Furniture Sustainability Standard sections 7.6.1 and 7.6.2, tested in accordance with ANSI/BIFMA Standard Method M7.1-2011.

Projects registered as New and Existing Interiors that can demonstrate that aspects of the base building design is outside of their control are not required to achieve Feature 05, Part 1: Filter Accommodation.

Projects unable to provide additional space for carbon filters may instead educate future tenants on their ability to buy and install stand-alone air purifiers with carbon filters. The project team must provide a letter signed by the project owner to confirm that if required for WELL certification in the future, the project owner will buy and install the air purifiers with filters on behalf of the tenant. It must be demonstrated that adequate wall space is accommodated to install wall-mounted air purifiers. The WELL Assessor will confirm the available wall space and examine a copy of all the information given to tenants during the project’s Performance Verification.

Change Part 1b from "The system is able to accommodate additional filters" to "The mechanical system is sized to accommodate the additional filters."

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To remove indoor and outdoor airborne contaminants through air filtration.'

In lieu of installing rack space for future carbon filters, an execution plan for future modifications to the HVAC system to create rack space for carbon filters may be provided in the event that the installation of carbon filters is a requirement of the WELL Building Standard in the future. To follow this approach, it must be confirmed that the system would be able to physically accept carbon filters should the necessary rack space be created, the plan must identify the cost estimates of renovating the HVAC system to include the necessary rack space to confirm that it is considered a capital improvement item, and the owner must commit to making the upgrades should the WELL Building Standard require carbon filters in a future recertification of the project.

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To reduce mold and bacteria growth within buildings, particularly from water damage or condensation on cooling coils.'

Add: "newly installed" after "all"

Add: "occurring within one year prior to Performance Verification" after "during construction"

In the Feature description, remove the second paragraph. Replace with the following text:
'Intent: To minimize the introduction of construction-related pollutants into indoor air and protect building products from degradation.'

In Part 3, change "To prevent building materials from absorbing and later releasing VOCs emitted by other (source) materials during construction, the following requirements are met: to "To prevent building materials from absorbing water or moisture during construction, the following requirements are met:"

Remove Parts 3b and 3c.

For Part 1b, add: "(sum of indoor and outdoor length)" after "primary direction of travel"

Remove: "Permanent" from title of Part name.

For projects that have an entryway walk off system that is less than 10 feet in length, but no smaller than 9’6’’, temporary rollout mats may be used during potential inclement weather (i.e. a 30% chance or higher) to bring the walk-off system up to 10 feet in length. In addition, projects must commit to cleaning the entrance/lobby multiple times daily, and demonstrate this through a cleaning plan. Provide the cleaning plan as well as a narrative detailing the project policy regarding rollout mats and inclement weather.