Smog got you down? Here's why air quality in Austin has been so bad this spring. - Austin Monitor
Briefly

Every year, farmers in the Yucatán Peninsula and neighboring regions set agricultural fires, with smoke traveling thousands of miles to affect regions like Texas. This year, increased wildfires in Mexico due to drought worsened the smog in Central Texas.
The prolonged drought in Mexico led to around 168 active wildfires contributing to the thick smog. Warm weather, lack of cold fronts, and humidity made the haze persist longer than usual this spring.
Read at Austin Monitor
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