{
  "slug": "gas-stove-no2-child-asthma",
  "question": "How likely is a child in a gas-stove household to develop asthma attributable to the stove?",
  "category": "health",
  "tags": [
    "kids",
    "child",
    "household"
  ],
  "no_reliable_estimate": false,
  "perceived": {
    "description": "Gas cooking is rarely named as a cause of childhood asthma. Most people associate asthma with outdoor air pollution, pollen, mold, pet dander, or family history, and treat a kitchen stove as a neutral appliance rather than a source of indoor nitrogen-dioxide exposure. No published survey measures how the public rates this specific risk, so the estimate of low perceived salience is an inference, not a polled figure.",
    "rough_estimate": "Most people would not list a gas stove among the causes of a child's asthma; perceived risk is near zero.",
    "kind": "intuition"
  },
  "native": {
    "display": "about 1 in 50",
    "numerator": 1,
    "denominator": 50,
    "unit": "children in gas-stove households",
    "population": "US children living in a household that cooks with a gas or propane stove"
  },
  "normalized": {
    "lifetime_us_adult": 0.02,
    "display": "about 1 in 50 (~2%)",
    "log_value": -1.7,
    "assumptions": "Subgroup: US children living in a gas/propane-stove household. Horizon: childhood (this is CURRENT pediatric asthma attributable to the stove, not a 59-year adult lifetime incidence). Two independent derivations converge near 2%. (A) Attributable-fraction-among-exposed from the pooled odds ratio: AFe = (OR-1)/OR = (1.34-1)/1.34 = 0.254. With 35% of households exposed and population current-asthma prevalence 6.5%, baseline (unexposed) prevalence p_u = 0.065/(0.35*1.34+0.65) = 5.81%, exposed prevalence p_e = 1.34*5.81% = 7.78%, attributable share among exposed = p_e - p_u = 1.98% ~ 2.0%. (B) Direct from Gruenwald PAF: 12.7% of all childhood asthma is stove-attributable; 12.7% * (6.5% * 72.3M children) / (35% * 72.3M exposed children) = 597k / 25.3M ~ 2.36%. Headline rounded to 2% (1 in 50). Lower bound 0.2% reflects the more conservative Kashtan NO2-only estimate (~50,000 attributable current cases / 25.3M exposed children ~ 0.2%); upper bound ~3% reflects the Gruenwald PAF central/high estimate. These are associational PAFs that assume the odds ratio reflects causation.",
    "uncertainty": {
      "low": 0.002,
      "high": 0.03
    },
    "scope": "subgroup_lifetime"
  },
  "sources": [
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC9819315/",
      "title": "Population Attributable Fraction of Gas Stoves and Childhood Asthma in the United States",
      "publisher": "International Journal of Environmental Research and Public Health (Gruenwald, Seals, Knibbs, Hosgood)",
      "source_type": "peer_reviewed",
      "statistic": "12.7% (95% CI = 6.3-19.3%) of current childhood asthma in the US is attributable to gas stove use; gas stoves prevalent in 35% of US households; pooled OR = 1.34 (95% CI 1.12-1.57)",
      "excerpt": "12.7% (95% CI = 6.3-19.3%) of current childhood asthma in the US is attributable to gas stove use.",
      "source_date": "2022-12-21",
      "source_accessed": "2026-06-13",
      "calculation_notes": "Supplies the population attributable fraction (12.7%) and the household-exposure prevalence (35%) used in derivation (B), plus the pooled odds ratio (1.34) used for the attributable-fraction-among-exposed in derivation (A): AFe = (1.34-1)/1.34 = 0.254.",
      "independence_note": "RMI/Einstein team; PAF method built on Lin et al. 2013 meta-analysis effect size. Methodologically distinct from the Kashtan exposure-modeling study."
    },
    {
      "url": "https://www.healio.com/news/allergy-asthma/20240503/nitrogen-dioxide-from-gas-stoves-associated-with-thousands-of-asthma-cases-in-the-us",
      "title": "Nitrogen dioxide from gas stoves associated with thousands of asthma cases in the US",
      "publisher": "Healio (reporting on Kashtan et al., Science Advances)",
      "source_type": "news_article",
      "statistic": "~50,000 current pediatric asthma cases from NO2 alone; ~200,000 current pediatric asthma cases counting other pollutants; up to ~19,000 premature adult deaths/yr (95% CI 8,500-34,000); NO2 increase of 4 ppbv (95% CI 2.4-6.1)",
      "excerpt": "Nitrogen dioxide (NO2) from gas and propane stoves may cause approximately 50,000 current pediatric asthma cases",
      "source_date": "2024-05-03",
      "source_accessed": "2026-06-13",
      "calculation_notes": "Provides the Kashtan et al. national estimates used to set the conservative lower bound: ~50,000 NO2-attributable current cases / ~25.3M exposed children ~ 0.2%; ~200,000 all-pollutant cases / 25.3M ~ 0.8%. Reports the underlying Science Advances figures verbatim.",
      "independence_note": "Secondary reporting on the primary Science Advances paper (Kashtan et al. 2024, doi:10.1126/sciadv.adm8680), whose own page returns HTTP 403 to automated fetch."
    },
    {
      "url": "https://www.cdc.gov/nchs/fastats/asthma.htm",
      "title": "FastStats: Asthma",
      "publisher": "CDC / National Center for Health Statistics",
      "source_type": "govt_report",
      "statistic": "Percent of children younger than age 18 years who currently have asthma: 6.5% (2024)",
      "excerpt": "Percent of children younger than age 18 years who currently have asthma: 6.5% (2024)",
      "source_date": "2024-01-01",
      "source_accessed": "2026-06-13",
      "calculation_notes": "Supplies the population current-asthma prevalence (6.5%) used as p_pop in derivation (A) and as the asthma base in derivation (B)."
    },
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC11402528/",
      "title": "Challenging unverified assumptions in causal claims: Do gas stoves increase risk of pediatric asthma?",
      "publisher": "Global Epidemiology (Cox)",
      "source_type": "peer_reviewed",
      "statistic": "Critique: PAFs are associational, not causal; neither Kashtan et al. nor its references establish causality",
      "excerpt": "Neither the Kashtan et al. paper nor its references analyze, let alone establish, causality.",
      "source_date": "2024-08-01",
      "source_accessed": "2026-06-13",
      "calculation_notes": "Not used arithmetically; caps the causal interpretation. Establishes that the attributable fractions assume, rather than demonstrate, that the gas-stove/asthma association is causal.",
      "independence_note": "Independent skeptical rebuttal; industry-adjacent critiques (American Gas Association) echo the same associational-vs-causal objection."
    }
  ],
  "comparison_anchors": [
    {
      "label": "Dying in a car crash (lifetime, US)",
      "lifetime_us_adult": 0.0095
    },
    {
      "label": "Vehicle theft (lifetime, US)",
      "lifetime_us_adult": 0.0296
    },
    {
      "label": "Stroke (lifetime)",
      "lifetime_us_adult": 0.067
    }
  ],
  "short_label": "Gas-stove asthma in a child",
  "outcome_severity": "moderate_harm",
  "exposure_pattern": "cumulative",
  "outcome_type": "chronic_illness",
  "valence": "negative",
  "caveats": "Every input is an associational population attributable fraction, not a measured causal risk. The Gruenwald 12.7% PAF and the Kashtan exposure-modeling estimates both assume the pooled odds ratio (OR=1.34, from a 2013 meta-analysis) reflects a causal effect of gas cooking. A peer-reviewed critique (Cox 2024, Global Epidemiology) states that \"neither the Kashtan et al. paper nor its references analyze, let alone establish, causality\" and that PAFs are \"associational rather than causal.\" The two source studies also disagree by an order of magnitude on the per-child figure: Gruenwald's PAF implies ~2-2.4%, Kashtan's all-pollutant estimate ~0.8%, and Kashtan's NO2-only estimate ~0.2%. The Kashtan 200,000-case figure carries a 95% CI that crosses zero. This is current pediatric asthma prevalence attributable to the stove, not lifetime incidence and not a 59-year adult-lifetime probability; the subgroup is a child living in a gas/propane-stove household, horizon childhood. Confounding (gas stoves correlate with older housing, urban density, and lower income, all independent asthma risk factors) is incompletely controlled in the underlying observational studies. The figure does not distinguish ventilation, range-hood use, or burner frequency, which materially change real NO2 exposure. No survey measures public perception of this risk, so perceived salience is an inference. Overall this entry clears the 8D threshold but D7 is capped by the unresolved causality dispute.",
  "quality_score": {
    "d1": 4,
    "d2": 5,
    "d3": 4,
    "d4": 4,
    "d5": 4,
    "d6": 4,
    "d7": 3,
    "d8": 5,
    "avg": 4.125,
    "scored_by": "claude-code-8d",
    "scored_at": "2026-06-13",
    "methodology_version": "8d-v1"
  },
  "reviewer": "8d-eval-2026-06-13",
  "last_reviewed": "2026-06-13",
  "reviewed": true,
  "generated_at": "2026-06-13",
  "image": {
    "alt": "An abstract gas burner ring dispersing into hazy air, muted blue-grey and warm sand, flat vector."
  },
  "attribution": "Likelier — https://likelier.app",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
  "support": "https://buymeacoffee.com/kgluszczyk?via=likelier&utm_content=api-fear-single",
  "canonical_url": "https://likelier.app/gas-stove-no2-child-asthma"
}