What does the EPA consider unhealthy air quality in Arizona?

The EPA considers PM2.5 pollution levels reaching "unhealthy" on the Air Quality Index as detrimental.

Why are fine particles dangerous according to the EPA?

Fine particles (PM2.5) are dangerous because they are small enough to be inhaled deep into the lungs and can enter the bloodstream.

Who is most at risk from unhealthy PM2.5 levels in Texas?

Older adults, children, and individuals with respiratory or cardiovascular conditions are most at risk.

Home / Environment / Fine Particle Alert: Southwest Residents Told to Stay Indoors

Fine Particle Alert: Southwest Residents Told to Stay Indoors

19 Jan

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Summary

Unhealthy PM2.5 levels in Arizona, New Mexico, and Texas prompt warnings.
Inhaling fine particles can irritate lungs, enter the bloodstream.
Sensitive groups advised to limit outdoor activity until air improves.

Fine Particle Alert: Southwest Residents Told to Stay Indoors

Residents across parts of Arizona, New Mexico, and Texas were urged to remain indoors on January 19, 2026, as fine particle pollution (PM2.5) reached "unhealthy" levels. The Environmental Protection Agency's AirNow Map indicated a significant decline in air quality, prompting these advisories. The microscopic PM2.5 particles, smaller than 2.5 micrometers, pose serious health risks when inhaled.

When PM2.5 levels are "unhealthy," these tiny particles can deeply penetrate the lungs and potentially enter the bloodstream. This can lead to eye, nose, and throat irritation, as well as more severe respiratory issues like chest tightness and shortness of breath. Individuals with pre-existing respiratory or cardiovascular conditions, such as asthma or COPD, are particularly vulnerable to these adverse effects.