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Paris Weather Sensor Manipulated with Hair Dryer, Claims Service

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Raj Patel verified
Crypto Casino & Gaming Industry Analyst

A crypto casino and gaming specialist, Raj brings a digital native’s perspective to industry trends and provably fair systems. Having reviewed over 150 platforms, he…

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A peculiar incident has unfolded involving a Paris airport weather sensor, where it is suspected that a hair dryer may have been used to manipulate readings, leading to an extraordinary $34,000 payout on the prediction market platform Polymarket. This anomaly has prompted France’s national meteorological agency, Météo France, to lodge a formal complaint.

On April 6 and April 15, two irregular readings were recorded at the Charles de Gaulle Airport sensor. These instances coincided with significant payouts on Polymarket. Following these events, Météo France took action, submitting a complaint to the Roissy airport gendarmerie, citing concerns over potential tampering with the automated data processing system.

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Details of the sensor anomalies are striking. On April 6, the device registered a sudden increase of around 4 degrees Celsius within just 12 minutes, reaching a peak of 22.5 degrees Celsius before stabilizing. A similar spike occurred on April 15, with the temperature climbing to 22 degrees Celsius, only to fall shortly thereafter. Notably, neighboring sensors did not report analogous fluctuations during these events.

Paul Marquis, a meteorologist and founder of E-Meteo Service, expressed skepticism about the natural occurrence of these anomalies. He indicated that the lack of changes in wind direction and humidity levels, as well as consistent readings from nearby stations, suggested that the most likely explanation was some form of physical intervention, likely involving heat.

Accessibility issues related to the sensor location were also noted. The CDG airport sensor is positioned near the runway and is reachable from a public roadway, making it susceptible to tampering.

Polymarket relies on the data from this sensor to resolve temperature markets, creating a direct financial link to the sensor’s accuracy. On the dates in question, users had placed long-shot bets on temperatures that ultimately resulted in substantial payouts. Reports indicated a payout of approximately $14,000 for a wager on temperatures reaching 21 degrees Celsius on April 6 and a subsequent payout of about $20,000 for a bet on 22 degrees Celsius on April 15.

The total gains from these episodes reached an astonishing $34,000. Following these incidents, concerns regarding manipulation began to emerge among Polymarket users, with many discussing potential insider trading.

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In response to the situation, Polymarket changed its resolution source from the compromised CDG sensor to the sensor at Paris-Le Bourget Airport, as of April 19, to eliminate reliance on the affected station. This shift reflects an awareness of the vulnerabilities present in prediction markets that depend heavily on a singular data source.

The incident has sparked significant discussions on French meteorological forums and social media, with users quickly identifying the suspicious readings and phrases like “hair dryer at a Paris airport” gaining traction.

Météo France has refrained from providing additional comments, other than acknowledging the complaint. As of now, no arrests have been made, and the investigation remains in progress. This case raises important questions regarding the integrity of prediction markets that hinge on data from isolated sensors, underscoring the risks of manipulation when financial outcomes are tied to a single point of measurement.

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Raj Patel

verified
Crypto Casino & Gaming Industry Analyst

A crypto casino and gaming specialist, Raj brings a digital native’s perspective to industry trends and provably fair systems. Having reviewed over 150 platforms, he balances a passion for innovation with a rigorous commitment to responsible gambling.

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Raj Patel
625 articles Since 2026
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