CARB Adopts 2019 AIM Suggested Control Measure

The California Air Resources Board (CARB) adopted a new Suggested Control Measure (SCM) for Architectural and Industrial Maintenance (AIM) coatings on May 23, 2019. The SCM is important since the various California Air Districts will use the new SCM to develop their future AIM rule revisions. In addition, the Northeast Ozone Transport Commission (OTC) states will likely also utilize the SCM in the development of lower AIM VOC limits in the Northeast states in the future (OTC Phase III).

This rulemaking could also impact many green building standards, since green building standards tend to reference the CARB AIM SCM.

The new “2019 CARB AIM SCM” is based on the California South Coast Air Quality Management District (SCAQMD) AIM Rule 1113. SCAQMD Rule 1113 is the country’s strictest regulation covering VOC in AIM products and includes over 20 limits that are lower than the current 2007 AIM SCM.

CARB initially indicated it would propose a 100 g/l limit for Stains, which would be more stringent than the current SCAQMD limits (SCAQMD includes a 250 g/l limit for interior stains). CARB ended up keeping interior stains at 250 g/g and lowering the limit for exterior/dual stains to 100g/l. CARB also initially indicated that it intended to include colorant limits that were more stringent than SCAQMD. However, CARB ultimately decided to adopt the current SCAQMD limits for colorants, but also included a higher limit of 600 g/l for wood coating colorants.

Based on ACA and industry comments, CARB retained the current limits for Industrial Maintenance; Zinc Rich Primers; Metallic Pigmented; Rust Preventatives; Concrete Cure; and Graphic Arts.

The various California Air Districts will now use the new SCM to develop their future AIM rule revisions. The Ventura Air Quality Management District is likely to propose amendments to their AIM rule in the next few months.

ACA, through its AIM VOC Committee, tracks advocates and provides compliance assistance on the various AIM VOC regulations.

Contact ACA’s David Darling for more information.

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