{
 "_meta": {
  "what": "Days Delhi spent in each CPCB AQI category, by calendar month, pooled over 2016 to 2025.",
  "source": "CPCB daily AQI bulletins, parsed from the published PDFs by UrbanEmissions.Info (github.com/urbanemissionsinfo/AQI_bulletins). Built by scripts/build-delhi-seasonal.py.",
  "years": "2016-2025",
  "no_mean": "No average AQI: an index of whichever pollutant scores worst is counted by category, not averaged. See _meta.no_annual_mean in aqi-bulletins.json.",
  "not_a_trend": "A seasonal profile pooled over ten years. Delhi went from 5 reporting stations in 2016 to 37 in 2025, so the years are not compared."
 },
 "city": "Delhi",
 "months": [
  {
   "month": 1,
   "label": "Jan",
   "days": 309,
   "by_category": {
    "Good": 0,
    "Satisfactory": 2,
    "Moderate": 16,
    "Poor": 92,
    "Very Poor": 167,
    "Severe": 32
   },
   "poor_or_worse": 291,
   "severe": 32,
   "share_poor_or_worse": 0.942
  },
  {
   "month": 2,
   "label": "Feb",
   "days": 283,
   "by_category": {
    "Good": 0,
    "Satisfactory": 3,
    "Moderate": 72,
    "Poor": 142,
    "Very Poor": 66,
    "Severe": 0
   },
   "poor_or_worse": 208,
   "severe": 0,
   "share_poor_or_worse": 0.735
  },
  {
   "month": 3,
   "label": "Mar",
   "days": 306,
   "by_category": {
    "Good": 1,
    "Satisfactory": 15,
    "Moderate": 163,
    "Poor": 121,
    "Very Poor": 6,
    "Severe": 0
   },
   "poor_or_worse": 127,
   "severe": 0,
   "share_poor_or_worse": 0.415
  },
  {
   "month": 4,
   "label": "Apr",
   "days": 300,
   "by_category": {
    "Good": 0,
    "Satisfactory": 16,
    "Moderate": 115,
    "Poor": 152,
    "Very Poor": 17,
    "Severe": 0
   },
   "poor_or_worse": 169,
   "severe": 0,
   "share_poor_or_worse": 0.563
  },
  {
   "month": 5,
   "label": "May",
   "days": 310,
   "by_category": {
    "Good": 0,
    "Satisfactory": 15,
    "Moderate": 150,
    "Poor": 125,
    "Very Poor": 20,
    "Severe": 0
   },
   "poor_or_worse": 145,
   "severe": 0,
   "share_poor_or_worse": 0.468
  },
  {
   "month": 6,
   "label": "Jun",
   "days": 298,
   "by_category": {
    "Good": 0,
    "Satisfactory": 43,
    "Moderate": 175,
    "Poor": 69,
    "Very Poor": 8,
    "Severe": 3
   },
   "poor_or_worse": 80,
   "severe": 3,
   "share_poor_or_worse": 0.268
  },
  {
   "month": 7,
   "label": "Jul",
   "days": 304,
   "by_category": {
    "Good": 2,
    "Satisfactory": 192,
    "Moderate": 99,
    "Poor": 10,
    "Very Poor": 1,
    "Severe": 0
   },
   "poor_or_worse": 11,
   "severe": 0,
   "share_poor_or_worse": 0.036
  },
  {
   "month": 8,
   "label": "Aug",
   "days": 309,
   "by_category": {
    "Good": 6,
    "Satisfactory": 190,
    "Moderate": 109,
    "Poor": 4,
    "Very Poor": 0,
    "Severe": 0
   },
   "poor_or_worse": 4,
   "severe": 0,
   "share_poor_or_worse": 0.013
  },
  {
   "month": 9,
   "label": "Sep",
   "days": 300,
   "by_category": {
    "Good": 2,
    "Satisfactory": 125,
    "Moderate": 163,
    "Poor": 10,
    "Very Poor": 0,
    "Severe": 0
   },
   "poor_or_worse": 10,
   "severe": 0,
   "share_poor_or_worse": 0.033
  },
  {
   "month": 10,
   "label": "Oct",
   "days": 309,
   "by_category": {
    "Good": 3,
    "Satisfactory": 16,
    "Moderate": 87,
    "Poor": 128,
    "Very Poor": 68,
    "Severe": 7
   },
   "poor_or_worse": 203,
   "severe": 7,
   "share_poor_or_worse": 0.657
  },
  {
   "month": 11,
   "label": "Nov",
   "days": 300,
   "by_category": {
    "Good": 0,
    "Satisfactory": 1,
    "Moderate": 6,
    "Poor": 52,
    "Very Poor": 168,
    "Severe": 73
   },
   "poor_or_worse": 293,
   "severe": 73,
   "share_poor_or_worse": 0.977
  },
  {
   "month": 12,
   "label": "Dec",
   "days": 310,
   "by_category": {
    "Good": 0,
    "Satisfactory": 0,
    "Moderate": 18,
    "Poor": 63,
    "Very Poor": 179,
    "Severe": 50
   },
   "poor_or_worse": 292,
   "severe": 50,
   "share_poor_or_worse": 0.942
  }
 ]
}