Blog

Articles about air quality, health, and pollution science.

Understanding PM2.5: Why Fine Particles Are the Deadliest Air Pollutant

PM2.5 kills an estimated 4.2 million people prematurely every year. These particles, smaller than 2.5 micrometers, bypass the body’s natural...

Cities With the Worst Air Quality in the World

New Delhi, Lahore, Dhaka, and Baghdad consistently rank among the most polluted cities globally. Delhi’s winter smog regularly pushes PM2.5 ...

How to Read the Air Quality Index (AQI)

The Air Quality Index converts raw pollutant concentrations into a simple 0–500 scale, with six color-coded categories. Green (0–50) means a...

Indoor Air Quality: The Hidden Pollution in Your Home

Indoor air can be two to five times more polluted than outdoor air, according to the EPA. The average person spends 90 percent of their time...

How Wildfires Are Reshaping Air Quality Across Continents

Wildfire smoke has become one of the largest contributors to air pollution in North America, Siberia, and Australia. The 2023 Canadian wildf...