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LCK 2026 Season Winner NBA: LeBron James Next Team US-Iran Final Nuclear Deal by…? Where will Maxx Crosby play in 2026? Will Ukraine recapture Crimean territory by...? Largest Company end of July? Pro Football: 2027 AFC Champion Where will Tyreek Hill play in 2026? Measles cases in U.S. in 2026? Which companies will be acquired before 2027? Will Satoshi move any Bitcoin in 2026? How many Fed rate cuts in 2026? Israel x Hamas ceasefire cancelled by...? US military action against Cuba by...? Israel and Indonesia normalize relations by...? MLB World Series Champion 2026 Will Jesus Christ return before 2027? Iran leadership change by...? What price will Ethereum hit in 2026? 2026 Men’s US Open Winner (Tennis)
Forecasts closed Polymarket

Chicago Air Quality Index below 100 by...?

Top outcomes

July 21 91%
July 20 0%
July 18 0%
July 19 0%

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.

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$21K Vol. Closed Jul 21, 2026

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$20.9k Vol.

All outcomes

Pick Yes or No on any outcome, then explain your pick below. Reputation-only — no money or trading.

$21K Vol.

July 21

91% market probability

91%
Yes 91% +9 / −91 No 9% +91 / −9

July 20

0% market probability

0%
Yes 0% +100 / −0 No 100% +0 / −100

July 18

0% market probability

0%
Yes 0% +100 / −0 No 100% +0 / −100

July 19

0% market probability

0%
Yes 0% +100 / −0 No 100% +0 / −100
Forecasts are closed because this event has already started.

Public forecast history

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No forecasts were placed before this market closed.