Air Quality in Major Cities: How to Compare the Data Correctly
Compare city air quality without misusing average AQI, using current WHO guidance and traceable official PM2.5 examples with explicit years and monitoring scopes.
8 min read
City Guides
City Guides Articles
5 articles in this category
Beijing vs New York Air Quality: What the Official Trends Show
Compare Beijing and New York with official PM2.5 monitoring data, clear time periods, and an honest explanation of why the two datasets are not interchangeable.
7 min read
European City Air Quality: Progress, Policies, and the Work Still Ahead
A source-based review of air-quality progress in London, Paris, and Stockholm, with official data, policy limits, and no unsupported clean-city claims.
8 min read
India Air Quality: Official PM2.5 Data and How to Read the Indian AQI
Understand India's air pollution with official PM2.5 data, the CPCB AQI system, National Clean Air Programme results, and a clear warning against mixing Indian and U.S. AQI.
8 min read
Wildfire Smoke and AQI: Why Air Quality Changes Far Downwind
Understand how wildfire smoke travels, why PM2.5 AQI changes quickly, how to read official smoke data, and what to do indoors, outdoors, in a vehicle, or during evacuation.
8 min read
Check Your Air Quality Exposure
Use a confirmed U.S. PM2.5 AQI to create a rough population-level health-impact comparison, or open a scenario guide for a practical decision.