Smoke School Information in New Hampshire

New Hampshire Acceptance Status for VirtualOpacity^® — EPA ALT-152A

Pending Acceptance.

New Hampshire Visible Emissions / Opacity Standard

The opacity limit for New Hampshire is 20% opacity for any continuous 6-min period, general and post-May 13, 1970 fuel-burning (Env-A 2103.02 / Env-A 2002.02); pre-May 13, 1970 fuel-burning devices: 40% opacity for any continuous 6-min period (Env-A 2002.01); SSM/soot blowing allowance per Env-A 2002.04, as established under Env-A 2103.02 (general, sources not otherwise regulated); Env-A 2002.02 (fuel-burning devices installed after May 13, 1970); SSM at Env-A 2002.04.

Compliance is demonstrated via EPA Method 9 (Env-A 807.02 – Testing for Opacity from Stationary Sources; Env-A 807 adopted into SIP).

Averaging period: Continuous 6-minute period

Env-A 2103.02 is the general 'catch-all' visible emissions standard for sources not subject to a source-specific chapter. Opacity testing procedures are in Env-A 807; continuous opacity monitoring is addressed in Env-A 808. EPA Method 9 certification required for observers.

Last verified July 8, 2026

Note: Regulations change — always verify current requirements with your state's air quality agency before making compliance decisions. This page is for informational purposes and is not legal advice; consult a qualified attorney or environmental compliance professional for guidance specific to your facility.