What are the emission limits for air curtain incinerators that burn 100 percent yard waste?

40 C.F.R. § 60.1920
in effect
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If your air curtain incinerator combusts 100 percent yard waste, you must only meet the emission limits in this section. (a) By 180 days after your final compliance date, you must meet two limits: (1) The opacity limit is 10 percent (6-minute average) for air curtain incinerators that can combust at least 35 tons per day of municipal solid waste and no more than 250 tons per day of municipal solid waste. (2) The opacity limit is 35 percent (6-minute average) during the startup period that is within the first 30 minutes of operation. (b) Except during malfunctions, the requirements of this subpart apply at all times. Each malfunction must not exceed 3 hours.
Source: ecfr_bulkFetched: 7/26/2026
Source: eCFR APIURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-40.xml?part=60Fetched: 5/31/2026