{
  "node_id": "us-clean-air-act-title-iv-acid-rain-so2-nox-epa",
  "title": "US Clean Air Act Title IV - Acid Rain Program SO2 and NOx Cap-and-Trade",
  "domain": "Energy & Utilities",
  "version": "2.0",
  "last_updated": "2026-05-10",
  "bluf": "Clean Air Act Title IV establishes the Acid Rain Program - a mandatory cap-and-trade system for sulfur dioxide (SO2) and nitrogen oxide (NOx) emissions from power plants - requiring annual allowance surrender, CEMS installation, and EPA permit compliance. Penalties up to $25,000 per day per violation.",
  "paywall": {
    "status": "LOCKED",
    "unlock_cost_usd": "0.01",
    "skyfire_id": "41779894-ece2-4163-9761-b3b1b76e19b0"
  },
  "crosswalks": {
    "_available_keys": [
      "frameworks",
      "standards",
      "industry_mapping"
    ],
    "_note": "Full crosswalk values included in vault response"
  },
  "primary_citations_count": 5
}