EPA AirNow Air Quality

The EPA AirNow API provides real-time and forecast air quality data across the United States, Canada, and Mexico from over 2,500 monitoring stations. Data includes AQI values for PM2.5, PM10, ozone, CO, NO2, and SO2 along with health category ratings. Forecasts cover more than 500 cities. Rate limited to 500 requests per hour with a free API key.

Try asking

What You Can Query

You can check current air quality observations by ZIP code or coordinates (observation/current), retrieve historical AQI data for any past date (observation/historical), and get air quality forecasts for upcoming days (forecast endpoint).

What You Can Do

Monitoring current air quality conditions by ZIP code or city

Checking AQI forecasts for outdoor event planning

Analyzing historical air quality trends during wildfire seasons

Comparing PM2.5 and ozone levels across metropolitan areas

Building health advisory tools based on real-time AQI data

Assessing air quality impacts for real estate and urban planning

Explore More Datasets

Discover other public datasets and live API connections you can chat with.

Stock Market Data (Yahoo Finance)

Real-time and historical stock prices, financials, dividends, and fundamentals for global equities, ETFs, indices, currencies, and crypto via yfinance — no API key required.

Yahoo Finance

FRED (Federal Reserve Economic Data) API

Access 800,000+ economic time series from the Federal Reserve — GDP, unemployment, inflation, interest rates, and more.

Federal Reserve Bank of St. Louis

Bureau of Labor Statistics

U.S. employment, unemployment, inflation (CPI), wages, and productivity data from the Bureau of Labor Statistics.

U.S. Department of Labor

SEC EDGAR

10-K, 10-Q, 8-K, proxy statements, insider trades, and XBRL financial data from all SEC corporate filings.

U.S. Securities and Exchange Commission

World Bank Development Indicators

Nearly 16,000 development indicators covering GDP, population, health, education, and trade for 200+ countries.

The World Bank Group

USA Spending Federal Government Spending

Free, comprehensive U.S. federal spending data covering contracts, grants, loans, and financial assistance across all government agencies.

U.S. Department of the Treasury

Frankfurter Currency Exchange Rates

Free currency exchange rates and conversion data from the European Central Bank, updated daily with 30+ currencies and historical data back to 1999.

Frankfurter / European Central Bank

U.S. Census Bureau API

Over 1,700 Census datasets covering demographics, housing, income, employment, and business data at all geographic levels.

U.S. Census Bureau

Census Demographics by ZIP Code & DMA

ZIP-level population, age, race, and ethnicity data from the 2024 ACS with DMA market area mappings.

U.S. Census Bureau

IRS Income Statistics by ZIP Code (2022)

ZIP-level income tax data with AGI brackets, income sources, deductions, and credits for 27,590 ZIP codes.

IRS Statistics of Income (SOI)

National Weather Service

Current conditions, forecasts, and severe weather alerts for U.S. locations via the National Weather Service.

National Weather Service (NOAA)

Open-Meteo Historical Weather Archive

Global historical weather reanalysis back to 1940 with hourly and daily variables by coordinate, no API key required.

Open-Meteo

CMS Medicare Provider Data

U.S. Medicare provider quality ratings, hospital comparisons, nursing home inspections, physician data, and healthcare spending from CMS.gov.

Centers for Medicare & Medicaid Services

USGS Earthquake Catalog

Real-time and historical earthquake data worldwide including magnitude, location, depth, and tsunami alerts from the USGS.

USGS Earthquake Hazards Program

USGS Water Data

Real-time and historical U.S. water data including streamflow, water levels, water quality, and groundwater measurements from USGS monitoring stations nationwide.

U.S. Geological Survey

College Scorecard

Institution-level and field-of-study data for 6,500+ colleges including costs, earnings, graduation rates, and admissions.

U.S. Department of Education

County Health Rankings (2025)

County-level health outcomes, behaviors, clinical care, and socioeconomic factors for 3,200+ U.S. counties.

Robert Wood Johnson Foundation / University of Wisconsin

Medicaid Provider Spending

Explore 26.8M+ Medicaid provider spending records from CMS — analyze claims, procedures, and payments by provider, state, ZIP code, and monthly trends from 2018–2024.

CMS (Centers for Medicare & Medicaid Services)

OpenFDA

FDA public data on drug adverse events, recalls, medical devices, food enforcement, and product labeling.

U.S. Food and Drug Administration

USDA FoodData Central

Nutrient profiles for 300,000+ foods including branded products, foundation foods, and survey data from the USDA.

USDA Agricultural Research Service

HUD User Housing Data

Fair Market Rents, income limits, USPS vacancy data, and geographic crosswalks from the U.S. Department of Housing and Urban Development.

HUD User

TrustMRR

Verified startup revenue, MRR, growth rates, and acquisition data for hundreds startups backed by real payment provider integrations.

TrustMRR

NASA APIs

Access NASA space and Earth science data including astronomy images, asteroid tracking, Mars rover photos, and space weather.

NASA

MLB Statcast (Baseball Savant)

Comprehensive MLB batting and pitching data — exit velocity, launch angle, pitch velocity, spin rate, expected stats, and advanced analytics for every play since 2015 via Baseball Savant.

MLB Advanced Media

NAICS Industry Classification Codes (2022)

Complete 2022 NAICS code hierarchy with all 2,122 industry classifications across 5 levels.

U.S. Census Bureau

US ZIP Code Geographic Reference

Geographic reference for 33,791 ZIP codes with state, county, coordinates, and land area.

U.S. Census Bureau

KenPom College Basketball Rating - March Madness

KenPom efficiency ratings, tempo, and NCAA Tournament seeds for every D-I team from 2000 to 2026.

KenPom.com