{"source":"polymarket","id":"714244","ticker":"chicago-air-quality-index-below-100-byptptpt-20260717130414628","slug":"chicago-air-quality-index-below-100-byptptpt-20260717130414628","title":"Chicago Air Quality Index below 100 by...?","description":"This market will resolve to \"Yes\" if \"Chicago\" has a PM2.5 Air Quality Index of below 100 between July 17, 2026 and the specified date. Otherwise, this market will resolve to \"No\".\n\nThis market's resolution source will be https://www.airnow.gov/state/?name=illinois. To get to the figures used to resolve this market, select the \"Historical Air Quality\" tab, then find the finalized figure for the\"Chicago\" row under the \"Daily AQI for PM2.5\" column.\n\nThis market may remain open for two days after the specified date to confirm the daily AQI figures for the specified timeframe. If the figures remain unavailable, another credible resolution source will be chosen.","image":"https://polymarket-upload.s3.us-east-2.amazonaws.com/chicago-air-quality-index-below-100-byptptpt-20260717130414628-jez6fcuBv4J9.jpg","icon":"https://polymarket-upload.s3.us-east-2.amazonaws.com/chicago-air-quality-index-below-100-byptptpt-20260717130414628-jez6fcuBv4J9.jpg","active":true,"closed":false,"start_date":"2026-07-17T16:36:06.307914Z","end_date":"2026-07-21T00:00:00Z","closed_time":null,"volume":551.5034420000001,"volume_24hr":551.503442,"volume_24h_change":null,"normalized_vol_24hr":15.04407024383545,"normalized_volume":8.10660457611084,"liquidity":1323.5385,"open_interest":272.02344200000005,"categories":["Climate and Weather"],"tags":[{"id":"101963","slug":"air","label":"air"},{"id":"100770","slug":"chicago","label":"Chicago"},{"id":"84","slug":"weather","label":"Weather"},{"id":"87","slug":"climate","label":"climate"},{"id":"101655","slug":"wildfire","label":"Wildfire"},{"id":"105652","slug":"pollution","label":"pollution"},{"id":"104180","slug":"weather-science","label":"Weather & Science"},{"id":"1474","slug":"climate-weather","label":"climate & weather"},{"id":"105654","slug":"air-quality","label":"Air Quality"}],"synthetic":false,"is_group":false,"group_key":null,"parent_event_id":null,"probability":null,"spread":null,"top_outcome":"July 21","top_outcome_probability":0.9,"top_outcome_prob_24h_change":0.405,"top_outcome_volume_24h_change":77.24307499999999,"updated_at":"2026-07-18T05:54:51.106113Z","fetched_at":"2026-07-18T05:54:51.106113Z","added_at":"2026-07-17T16:53:19.046338Z","url":"https://polymarket.com/event/chicago-air-quality-index-below-100-byptptpt-20260717130414628","chart_24h":[0.0,95.880367,371.26036700000003,408.183442,408.183442,408.183442,420.10344200000003,420.10344200000003,420.10344200000003,420.10344200000003,420.10344200000003,420.10344200000003,420.10344200000003,420.10344200000003,420.10344200000003,523.103442,523.103442,551.503442,551.503442,551.503442],"markets":[{"source":"polymarket","id":"2960346","event_id":"714244","slug":"chicago-air-quality-index-below-100-by-july-21-2026-20260717130414632","question":"Chicago Air Quality Index below 100 by July 21, 2026?","group_item_title":"July 21","description":"This market will resolve to \"Yes\" if \"Chicago\" has a PM2.5 Air Quality Index of below 100 between July 17, 2026 and the specified date. Otherwise, this market will resolve to \"No\".\n\nThis market's resolution source will be https://www.airnow.gov/state/?name=illinois. To get to the figures used to resolve this market, select the \"Historical Air Quality\" tab, then find the finalized figure for the\"Chicago\" row under the \"Daily AQI for PM2.5\" column.\n\nThis market may remain open for two days after the specified date to confirm the daily AQI figures for the specified timeframe. If the figures remain unavailable, another credible resolution source will be chosen.","image":"","icon":"","outcomes":["Yes","No"],"outcome_prices":[0.9,0.1],"probability":0.9,"spread":0.04,"active":true,"closed":false,"start_date":"2026-07-17T16:36:11.239645Z","end_date":"2026-07-21T00:00:00Z","closed_time":null,"volume":77.243075,"volume_24hr":77.24307499999999,"prob_24h_change":0.405,"volume_24h_change":77.24307499999999,"normalized_vol_24hr":7.971280097961426,"normalized_volume":5.331526279449463,"liquidity":241.9153,"categories":["Climate and Weather"],"countries":["United States"],"updated_at":"2026-07-18T05:56:20.473029Z","fetched_at":"2026-07-18T05:54:51.379669Z","added_at":"2026-07-17T16:53:19.098023Z","url":"https://polymarket.com/event/chicago-air-quality-index-below-100-byptptpt-20260717130414628/chicago-air-quality-index-below-100-by-july-21-2026-20260717130414632","event_title":"Chicago Air Quality Index below 100 by...?","chart_24h":[0.495,0.905,0.9,0.905,0.9,0.91,0.905,0.91,0.925,0.92,0.895,0.895,0.9]},{"source":"polymarket","id":"2960345","event_id":"714244","slug":"chicago-air-quality-index-below-100-by-july-20-2026-20260717130414631","question":"Chicago Air Quality Index below 100 by July 20, 2026?","group_item_title":"July 20","description":"This market will resolve to \"Yes\" if \"Chicago\" has a PM2.5 Air Quality Index of below 100 between July 17, 2026 and the specified date. Otherwise, this market will resolve to \"No\".\n\nThis market's resolution source will be https://www.airnow.gov/state/?name=illinois. To get to the figures used to resolve this market, select the \"Historical Air Quality\" tab, then find the finalized figure for the\"Chicago\" row under the \"Daily AQI for PM2.5\" column.\n\nThis market may remain open for two days after the specified date to confirm the daily AQI figures for the specified timeframe. If the figures remain unavailable, another credible resolution source will be chosen.","image":"","icon":"","outcomes":["Yes","No"],"outcome_prices":[0.865,0.135],"probability":0.865,"spread":0.03,"active":true,"closed":false,"start_date":"2026-07-17T16:36:06.307914Z","end_date":"2026-07-20T23:59:00Z","closed_time":null,"volume":68.49666500000001,"volume_24hr":68.49666500000001,"prob_24h_change":0.37,"volume_24h_change":68.49666500000001,"normalized_vol_24hr":7.543701648712158,"normalized_volume":5.045544147491455,"liquidity":850.126,"categories":["Climate and Weather"],"countries":["United States"],"updated_at":"2026-07-17T20:46:49.690528Z","fetched_at":"2026-07-17T20:46:32.635748Z","added_at":"2026-07-17T16:53:19.098023Z","url":"https://polymarket.com/event/chicago-air-quality-index-below-100-byptptpt-20260717130414628/chicago-air-quality-index-below-100-by-july-20-2026-20260717130414631","event_title":"Chicago Air Quality Index below 100 by...?","chart_24h":[0.495,0.835,0.855,0.855,0.855,0.855,0.865]},{"source":"polymarket","id":"2960344","event_id":"714244","slug":"chicago-air-quality-index-below-100-by-july-19-2026-20260717130414630","question":"Chicago Air Quality Index below 100 by July 19, 2026?","group_item_title":"July 19","description":"This market will resolve to \"Yes\" if \"Chicago\" has a PM2.5 Air Quality Index of below 100 between July 17, 2026 and the specified date. Otherwise, this market will resolve to \"No\".\n\nThis market's resolution source will be https://www.airnow.gov/state/?name=illinois. To get to the figures used to resolve this market, select the \"Historical Air Quality\" tab, then find the finalized figure for the\"Chicago\" row under the \"Daily AQI for PM2.5\" column.\n\nThis market may remain open for two days after the specified date to confirm the daily AQI figures for the specified timeframe. If the figures remain unavailable, another credible resolution source will be chosen.","image":"","icon":"","outcomes":["Yes","No"],"outcome_prices":[0.74,0.26],"probability":0.74,"spread":0.04,"active":true,"closed":false,"start_date":"2026-07-17T16:36:08.399956Z","end_date":"2026-07-19T23:59:00Z","closed_time":null,"volume":230.763702,"volume_24hr":230.763702,"prob_24h_change":0.245,"volume_24h_change":230.763702,"normalized_vol_24hr":12.4365873336792,"normalized_volume":8.318111419677734,"liquidity":633.3515,"categories":["Climate and Weather"],"countries":["United States"],"updated_at":"2026-07-18T04:50:47.026900Z","fetched_at":"2026-07-18T04:49:47.745400Z","added_at":"2026-07-17T16:53:19.098023Z","url":"https://polymarket.com/event/chicago-air-quality-index-below-100-byptptpt-20260717130414628/chicago-air-quality-index-below-100-by-july-19-2026-20260717130414630","event_title":"Chicago Air Quality Index below 100 by...?","chart_24h":[0.495,0.735,0.765,0.77,0.77,0.785,0.76,0.785,0.76,0.76,0.765,0.76,0.74,0.735,0.74]},{"source":"polymarket","id":"2960343","event_id":"714244","slug":"chicago-air-quality-index-below-100-by-july-18-2026-20260717130414629","question":"Chicago Air Quality Index below 100 by July 18, 2026?","group_item_title":"July 18","description":"This market will resolve to \"Yes\" if \"Chicago\" has a PM2.5 Air Quality Index of below 100 between July 17, 2026 and the specified date. Otherwise, this market will resolve to \"No\".\n\nThis market's resolution source will be https://www.airnow.gov/state/?name=illinois. To get to the figures used to resolve this market, select the \"Historical Air Quality\" tab, then find the finalized figure for the\"Chicago\" row under the \"Daily AQI for PM2.5\" column.\n\nThis market may remain open for two days after the specified date to confirm the daily AQI figures for the specified timeframe. If the figures remain unavailable, another credible resolution source will be chosen.","image":"","icon":"","outcomes":["Yes","No"],"outcome_prices":[0.36,0.64],"probability":0.36,"spread":0.06,"active":true,"closed":false,"start_date":"2026-07-17T16:36:10.212028Z","end_date":"2026-07-18T23:59:00Z","closed_time":null,"volume":175.0,"volume_24hr":175.0,"prob_24h_change":-0.14,"volume_24h_change":175.0,"normalized_vol_24hr":11.211230278015137,"normalized_volume":7.498540878295898,"liquidity":133.806,"categories":["Climate and Weather"],"countries":["United States"],"updated_at":"2026-07-18T05:09:30.903835Z","fetched_at":"2026-07-18T05:08:40.536153Z","added_at":"2026-07-17T16:53:19.098023Z","url":"https://polymarket.com/event/chicago-air-quality-index-below-100-byptptpt-20260717130414628/chicago-air-quality-index-below-100-by-july-18-2026-20260717130414629","event_title":"Chicago Air Quality Index below 100 by...?","chart_24h":[0.5,0.535,0.535,0.53,0.52,0.51,0.48,0.29,0.335,0.31,0.36]}],"_meta":{"attribution":"pdata.world — aggregated prediction-market data across 8 platforms","canonical_url":"https://pdata.world/events/polymarket/714244","as_of":"2026-07-18T06:11:09.937253Z","docs":"https://api.pdata.world/docs","cite_as":"According to pdata.world (tracking Polymarket): \"Chicago Air Quality Index below 100 by...?\" — top market at 74% probability across 4 outcomes","source_url":null}}