A hazardous air quality alert has been issued across parts of the Southwest, with officials urging residents to remain indoors as a large plume of polluted air moves through the region.
The U.S. Environmental Protection Agency (EPA) reported that an approximately 80-mile-wide area spanning parts of Arizona and California is experiencing dangerous levels of particulate matter.
The most severely affected area is Yuma, Arizona, where air quality has reached the “hazardous” category, the highest level on the EPA’s scale. More than 200,000 people live within the impacted zone, which stretches roughly 90 miles north from the U.S.-Mexico border.
The pollution is being driven by a combination of dust storms and airborne particles, which are common in the region but have intensified in this case.
At the center of the issue are microscopic pollutants known as PM2.5 and larger particles referred to as PM10.
These particles are small enough to be inhaled into the lungs, where they can cause irritation, inflammation, and more serious health problems.
In some cases, they can even enter the bloodstream.
Air quality readings in Yuma reached an Air Quality Index, or AQI, of 400.
On the AQI scale, which ranges from 0 to 500, any reading above 300 is considered extremely hazardous.
At that level, the risk is not limited to vulnerable populations.
Everyone exposed to the air can experience negative health effects.
Local weather officials reported that strong winds and dust have played a significant role in worsening conditions.
“It would be a good idea to stay indoors,” one forecaster said as the alert remained in effect through the evening.
Health authorities have issued clear guidance for residents in the affected areas.
People are being advised to stay inside, keep windows and doors closed, and avoid any unnecessary outdoor activity.
Using air conditioning systems or air purifiers may help reduce the amount of polluted air entering homes.
Certain groups face a higher level of risk.
Children, older adults, pregnant individuals, and people with pre-existing heart or lung conditions are especially vulnerable to the effects of poor air quality.
However, at the current levels, even healthy individuals may experience symptoms.
These can include throat irritation, coughing, shortness of breath, and difficulty breathing after prolonged exposure.
Officials have warned that extended time outdoors could lead to more serious complications, including asthma attacks and increased strain on the heart.
Dust storms along the U.S.-Mexico border are not unusual, but the severity of this event has raised concern among public health officials, per the Daily Mail.
The combination of fine and coarse particles has created a situation where both visibility and air safety are impacted.
AccuWeather and other monitoring systems have confirmed that pollution levels remain in the unhealthy to hazardous range.
