Daily County-Level Ozone Concentration Predictions from EPA Model, 2001-2022

2001-2022 modeled daily ozone concentration predictions at the U.S. county level, generated by the EPA's Downscaler model. The data are used by the CDC's National Environmental Public Health Tracking Network and include maximum, median, mean, and population-weighted mean values. The dataset was last updated on the platform in April 2026.

Use Cases

• Analyzing long-term ozone trends by county and state using the date, year, statefips, and countyfips columns.
• Comparing different statistical measures of air pollution (e.g., o3_max_pred vs. o3_pop_pred) to assess population exposure.
• Correlating modeled ozone levels (o3_mean_pred) with health outcome data using countyfips as a join key.

Strengths

• Covers a 22-year time range (2001-2022) for longitudinal analysis.
• Provides four distinct statistical measures (max, median, mean, population-weighted mean) for each county-day observation.
• Data is sourced from an authoritative EPA model and curated by the CDC's public health tracking program.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Data are modeled predictions, not direct ground measurements, which may introduce uncertainty.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

U.S. Environmental Protection Agency (EPA) Downscaler model, disseminated via CDC's National Environmental Public Health Tracking Network.

Collection Method

Modeled predictions from the EPA's Downscaler model.

Time Range

2001-2022

Freshness

Last updated 2026-04-14 13:57:33; freshness should be verified.

Geography

County-level for the United States, indicated by statefips and countyfips columns.