What environmental indicator is associated with poor visibility?

Stratiform clouds are associated with poor visibility due to their thick, uniform nature, which can create a low ceiling and lead to haze. These clouds, often characterized by their extensive coverage, can block sunlight and trap moisture, resulting in fog or reduced visibility conditions. The presence of stratiform clouds generally indicates stable weather conditions, which can contribute to the formation of fog, especially when the air is humid.

In contrast, high wind speeds can often improve visibility as they disperse pollutants and reduce fog formation. Clear air masses generally bring good visibility and are associated with fair weather conditions. Rapid changes in pressure can indicate shifting weather patterns, but they don’t necessarily correlate directly with poor visibility. Therefore, stratiform clouds stand out as the primary environmental indicator of reduced visibility.