Darley Data Center℠

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Chicago Fire Department

Cook County • Performance Metrics 2019 – 2024

Trimmed Mean (5%) Response Time

5.6 min

9.0%vs 2019

Trimmed Mean (5%) Scene Time

43.0 min

5.2%vs 2019

Trimmed Mean (5%) Clear Time

48.5 min

3.7%vs 2019

Performance Trends

Compare Chicago Fire Department against county and state trimmed mean (5%)s.

Response Time: Time from alarm to arrival on scene.

Calculated as a 5% trimmed mean, removing the lowest and highest 5% of incident durations before averaging.Source: NFIRS Public Historical Dataset.

Key Insights

Chicago Fire Department maintains a 5.6-minute trimmed mean (5%) response time, compared to the Cook County trimmed mean (5%) of 5.2 minutes
Scene time has improved by 5.2% since 2019, showing enhanced operational efficiency

Data Source and Accuracy: All data is currently sourced from the National Fire Incident Reporting System (NFIRS). Once the National Emergency Response Information System (NERIS) releases its public version, "NERIS Public," we will transition to using it. We only manipulate data when calculating averages for state and county metrics (such as clear times, scene times, and response times). In these cases, we may remove outliers to prevent a single data point from skewing the overall results. Otherwise, we report the data directly from the NFIRS public database. We will label this on each section for transparency.