{ "schema": "OTR-SIGNALS-CARD-REVISION-1", "revision_id": "OTR-SIGNALS-20261006-0017Z-R1-SG-20261004-PSI-CENTRAL-UPDATE-01-REV1", "revision_release_id": "OTR-SIGNALS-20261006-0017Z-R1", "target_signal_id": "SG-20261004-PSI-CENTRAL-UPDATE-01", "sequence": 1, "original_release_id": "OTR-SIGNALS-20261004-1719Z-R2", "original_release_sha256": "81f1c9351b4ff22f3fecfb514878fb08317424ee406fdfa5e57d13b14f2c2889", "original_record_sha256": "8dedd81b43c3f71aabb9217d8318874a0ee2ba28d5d5d8f887ecfd0080577716", "first_published_at_utc": "2026-10-04T17:54:01.701436Z", "revision_observation_clock_utc": null, "revision_published_at_utc": null, "publication_status": "READY_FOR_RELEASE", "research_cutoff_utc": null, "record": { "schema": "OTR-SIGNALS-CATEGORY-CARD-1", "id": "SG-20261004-PSI-CENTRAL-UPDATE-01", "release_id": "OTR-SIGNALS-20261004-1719Z-R2", "publication_status": "READY", "status": "REVIEWED_EDITORIAL_CARD", "primary_category": "singapore", "categories": [ "singapore" ], "title": "Singapore’s 5 October haze readings make location and timing matter", "summary": "NEA’s 5 October, 7pm SGT snapshot put 24-hour PSI at 97–124 and 1-hour PM2.5 at 72–109 µg/m³. These dated readings extend Sunday’s brief central dip. Outdoor plans need the latest local reading and forecast, rather than treating an earlier range as live.", "signal_claim": "The same episode has moved beyond Sunday’s two snapshots. Decisions need a fresh local exposure reading and forecast, even when a previous regional reading briefly fell below the unhealthy threshold.", "thesis": "The same episode has moved beyond Sunday’s two snapshots. Decisions need a fresh local exposure reading and forecast, even when a previous regional reading briefly fell below the unhealthy threshold.", "signal_family": "editorial_clue", "maturity": "early clue", "card_scope": "current_editorial_signal", "kind": "editorial_signal", "observations": [ { "fact": "NEA reported 24-hour PSI 97–124 and 1-hour PM2.5 72–109 µg/m³ at 7pm SGT on 5 October." }, { "fact": "It saw smoke drifting from southern Sumatra and forecast high-moderate to mid-unhealthy PSI. Cloud cover limited the satellite picture." } ], "sources": [ { "title": "Air quality briefly returns to unhealthy range in central Singapore", "publisher": "CNA", "url": "https://www.channelnewsasia.com/singapore/air-quality-unhealthy-range-central-singapore-haze-6430901", "source_clock": "Visible article body does not show a publication timestamp; 9pm and 11pm on 4 Oct 2026 are event/snapshot clocks.", "event_clock": null, "retrieved_at_utc_approx": "2026-10-04T17:12:43Z", "source_id": "SRC-SG-CNA-PSI-CENTRAL-20261004" }, { "title": "Haze Situation Update (4 October 2026)", "publisher": "National Environment Agency", "url": "https://www.nea.gov.sg/media/news/advisories/index/haze-situation-update-4-october-2026", "source_clock": "04 Oct 2026; update reads as at 5pm.", "event_clock": null, "retrieved_at_utc_approx": "2026-10-04T17:11:32Z", "source_id": "SRC-SG-NEA-HAZE-20261004" }, { "title": "Haze Situation Update (05 October 2026)", "publisher": "Meteorological Service Singapore", "url": "https://www.weather.gov.sg/haze-situation-update-05-october-2026/", "source_clock": { "published_at_utc": null, "normalized_utc": null, "original": "MSS source page dated 5 Oct 2026; page publication/update hour not separately recorded.", "precision": "day", "timezone": "not stated", "basis": "source page date only; 18:00 SGT is a measurement clock, not publication time." }, "event_clock": { "original": "MSS readings stated as at 18:00 SGT on 5 Oct 2026: PM2.5 75–97 µg/m³ (1-hour) and PSI 94–122 (24-hour).", "precision": "minute", "timezone": "SGT" } }, { "title": "Haze continues to worsen", "publisher": "8world (attributing figures to NEA)", "url": "https://www.8world.com/singapore/haze-continues-to-worsen-3300066", "source_clock": { "published_at_utc": "2026-10-05T11:10Z", "normalized_utc": null, "original": "8world page published 5 Oct 19:10 SGT (11:10 UTC); reported measurement at 19:00 SGT (11:00 UTC).", "precision": "minute", "timezone": "SGT / UTC as displayed", "basis": "source publication clock; measurements are separately clocked." }, "event_clock": { "original": "Reported NEA-attributed station readings measured at 19:00 SGT on 5 Oct 2026.", "precision": "minute", "timezone": "SGT" } }, { "title": "Haze Situation Update (5 October 2026)", "publisher": "National Environment Agency", "url": "https://www.nea.gov.sg/media/news/advisories/index/haze-situation-update-5-october-2026", "source_clock": { "original": "05 Oct 2026", "normalized_utc": null, "precision": "date", "note": "Page publication time not stated; 7pm is measurement time." }, "event_clock": { "measurement_local": "2026-10-05T19:00:00+08:00", "measurement_utc": "2026-10-05T11:00:00Z", "forecast": "Next-day forecast in this advisory; not a current sensor feed." }, "source_id": "SG-NEA-HAZE-20261005" } ], "source_links": [ "https://www.channelnewsasia.com/singapore/air-quality-unhealthy-range-central-singapore-haze-6430901", "https://www.nea.gov.sg/media/news/advisories/index/haze-situation-update-4-october-2026", "https://www.weather.gov.sg/haze-situation-update-05-october-2026/", "https://www.8world.com/singapore/haze-continues-to-worsen-3300066", "https://www.nea.gov.sg/media/news/advisories/index/haze-situation-update-5-october-2026" ], "source_copy_method": null, "source_clock_display": "", "desk_research_window": { "start_utc": "2026-10-03T17:13:29Z", "end_utc": "2026-10-04T17:13:29Z" }, "freshness_note": "Within the 24h window ending at cutoff: source event snapshots at 9pm and 11pm SGT on 4 Oct and NEA 5pm advisory. Retain earlier Drive observation for same episode.", "analysis": { "mechanism": "The same episode has moved beyond Sunday’s two snapshots. Decisions need a fresh local exposure reading and forecast, even when a previous regional reading briefly fell below the unhealthy threshold.", "impact": "Singapore residents and organisers planning outdoor activities.", "uncertainties": "Fresh NEA readings and forecasts show sustained improvement; the practical caution should then be updated.", "countercase": "These are dated snapshots, not proof of continuous exposure, nationwide unhealthy PSI or conditions at the moment a reader opens the page.", "next_check": "Later NEA measurements and forecasts show whether local exposure persists.", "named_assets": [], "directional_takeaway": "UNASSIGNED / NO ENTRY; no listed-asset conclusion." }, "fact_review_state": "APPROVED", "review": { "status": "APPROVED" }, "uncertainty": "These are dated snapshots, not proof of continuous exposure, nationwide unhealthy PSI or conditions at the moment a reader opens the page.", "next_check": "Later NEA measurements and forecasts show whether local exposure persists.", "named_assets": [], "directional_takeaway": "UNASSIGNED / NO ENTRY; no listed-asset conclusion.", "episode_key": "SG.HAZE.CENTRAL.PSI.2026-10-04", "image_url": null, "image_alt": null, "source_date": null, "review_status": "APPROVED", "source_primary_category": "singapore", "public_expanded_text": "The earlier Sunday report recorded central PSI at 101 at 9pm and 99 at 11pm. On Monday, 5 October, MSS reported 1-hour PM2.5 of 75–97 µg/m³ and 24-hour PSI of 94–122 at 6pm SGT.\n\nAt 7pm, NEA reported 1-hour PM2.5 of 72–109 µg/m³ and 24-hour PSI of 97–124. An 8world report attributed central/west/east PSI of 124/121/104 and north/south PSI of 97 to NEA at that same 7pm measurement.\n\nThe official NEA advisory corroborates that 7pm range and forecasts high-moderate to mid-unhealthy PSI. It adds source confirmation, not a later measurement.\n\nOTR’s view: location, measurement time and averaging period govern the decision. These snapshots do not show continuous exposure or nationwide unhealthy PSI.\n\nFor immediate outdoor activity, follow NEA’s current 1-hour PM2.5 guide; use its latest 24-hour PSI forecast to plan the next day. The 5 October evening readings are historical, not current conditions.\n\nWatch the next clocked official local readings. Sustained improvement would reduce the immediate caution; fresh deterioration would strengthen it.", "source_clock_values_preserved": [ { "url": "https://www.channelnewsasia.com/singapore/air-quality-unhealthy-range-central-singapore-haze-6430901", "source_clock": "Visible article body does not show a publication timestamp; 9pm and 11pm on 4 Oct 2026 are event/snapshot clocks.", "event_clock": null }, { "url": "https://www.nea.gov.sg/media/news/advisories/index/haze-situation-update-4-october-2026", "source_clock": "04 Oct 2026; update reads as at 5pm.", "event_clock": null }, { "url": "https://www.weather.gov.sg/haze-situation-update-05-october-2026/", "source_clock": { "published_at_utc": null, "normalized_utc": null, "original": "MSS source page dated 5 Oct 2026; page publication/update hour not separately recorded.", "precision": "day", "timezone": "not stated", "basis": "source page date only; 18:00 SGT is a measurement clock, not publication time." }, "event_clock": { "original": "MSS readings stated as at 18:00 SGT on 5 Oct 2026: PM2.5 75–97 µg/m³ (1-hour) and PSI 94–122 (24-hour).", "precision": "minute", "timezone": "SGT" } }, { "url": "https://www.8world.com/singapore/haze-continues-to-worsen-3300066", "source_clock": { "published_at_utc": "2026-10-05T11:10Z", "normalized_utc": null, "original": "8world page published 5 Oct 19:10 SGT (11:10 UTC); reported measurement at 19:00 SGT (11:00 UTC).", "precision": "minute", "timezone": "SGT / UTC as displayed", "basis": "source publication clock; measurements are separately clocked." }, "event_clock": { "original": "Reported NEA-attributed station readings measured at 19:00 SGT on 5 Oct 2026.", "precision": "minute", "timezone": "SGT" } }, { "url": "https://www.nea.gov.sg/media/news/advisories/index/haze-situation-update-5-october-2026", "source_clock": { "original": "05 Oct 2026", "normalized_utc": null, "precision": "date", "note": "Page publication time not stated; 7pm is measurement time." }, "event_clock": { "measurement_local": "2026-10-05T19:00:00+08:00", "measurement_utc": "2026-10-05T11:00:00Z", "forecast": "Next-day forecast in this advisory; not a current sensor feed." } } ], "trade_stance": "NO ENTRY", "first_publication_version_number": 1160, "publication_clock_registry_path": "/data/signals/publication-clock-registry.json", "signal_revision": { "sequence": 1, "revision_id": "OTR-SIGNALS-20261006-0017Z-R1-SG-20261004-PSI-CENTRAL-UPDATE-01-REV1", "first_published_at_utc": "2026-10-04T17:54:01.701436Z", "revised_at_utc": null, "revised_observation_clock_utc": null, "revision_note": "NEA’s 5 October, 7pm SGT snapshot put 24-hour PSI at 97–124 and 1-hour PM2.5 at 72–109 µg/m³. These dated readings extend Sunday’s brief central dip. Outdoor plans need the latest local reading and forecast, rather than treating an earlier range as live.", "previous_record_sha256": "8dedd81b43c3f71aabb9217d8318874a0ee2ba28d5d5d8f887ecfd0080577716" }, "first_published_at_utc": "2026-10-04T17:54:01.701436Z", "revision_count": 1, "revision_id": "OTR-SIGNALS-20261006-0017Z-R1-SG-20261004-PSI-CENTRAL-UPDATE-01-REV1", "revision_release_id": "OTR-SIGNALS-20261006-0017Z-R1", "revision_published_at_utc": null, "revision_observation_clock_utc": null, "revision_highlight": { "what_new": "NEA’s 5 October, 7pm SGT snapshot put 24-hour PSI at 97–124 and 1-hour PM2.5 at 72–109 µg/m³. These dated readings extend Sunday’s brief central dip. Outdoor plans need the latest local reading and forecast, rather than treating an earlier range as live.", "updated_finding": "The same episode has moved beyond Sunday’s two snapshots. Decisions need a fresh local exposure reading and forecast, even when a previous regional reading briefly fell below the unhealthy threshold." } } }