OpenAQ Air Quality Tracker — PM2.5, PM10, NO2, O3, CO, SO2
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OpenAQ Air Quality Tracker — PM2.5, PM10, NO2, O3, CO, SO2
Fetch real-time and historical air quality measurements from 30,000+ monitoring stations worldwide via the OpenAQ API v3. Supports PM2.5, PM10, NO2, O3, CO, SO2 across any country. Returns AQI category per reading. No API key required — optional key raises rate limits.