Which city experienced a massive dust storm leaving thousands without power?

The incident in question involves a significant dust storm that impacted Phoenix, Arizona. Such dust storms, often referred to as "haboobs," are common in arid regions, particularly in the southwestern United States, especially during the monsoon season. These storms can develop rapidly and have the capacity to reduce visibility to zero, resulting in hazardous conditions for driving and other outdoor activities.

In the case of Phoenix, the dust storm not only led to a dramatic decrease in air quality and visibility but also caused extensive damage to infrastructure, leaving thousands of residents without power. High winds associated with the storm can uproot trees, knock down power lines, and damage buildings, which contributes to widespread power outages.

While other cities in the list, such as Las Vegas, Los Angeles, and Houston, may experience their own weather-related events, they did not face a massive dust storm with the same severe consequences as Phoenix, making it the correct answer in this scenario.