---
title: "Chicago Air Quality Index below 100 by...?"
canonical_url: https://betcrypto.now/events/chicago-air-quality-index-below-100-by
status: ended
trading_closes_at: 2026-07-21T00:00:00+00:00
total_volume_usd: 21366.52
venues: ["Polymarket"]
categories: ["Tech & Science"]
prices_as_of: 2026-10-11T16:31:22+00:00
publisher: BetCrypto
data_api: https://betcrypto.now/api/v1/events/chicago-air-quality-index-below-100-by
---

# Chicago Air Quality Index below 100 by...?

Ended · $21,367 traded · listed on Polymarket

## Result

Delisted by every venue without a result — this event will not resolve.

## About

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".

This 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.

This 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.

_From Polymarket's listing._

## July 21

| Outcome | Probability | Cheapest | Polymarket |
|---|---|---|---|
| Yes | — | — | 98¢ |
| No | — | — | 2.3¢ |

## Other markets

- July 18 — 2 outcomes
- July 19 — 2 outcomes
- July 20 — 2 outcomes

_Every market's prices are on the event page._

## Open on a venue

- [Polymarket](https://betcrypto.now/go/e/48111?via=md)

---

Probability is the cross-venue consensus (book midpoints, 0–100%). Venue columns are what buying costs there (the ask). Prices move constantly; re-check at the canonical URL or https://betcrypto.now/api/v1/events/chicago-air-quality-index-below-100-by.

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