Which weather description relates to both "BR" and "FG" in reports?

The correct relation between "BR" and "FG" in weather reports is found in the term "Mist and fog." "BR" stands for mist, which is characterized by reduced visibility due to water droplets suspended in the air. On the other hand, "FG" denotes fog, which involves denser water droplets leading to even lower visibility conditions.

Both mist and fog are phenomena that result from high humidity and are pivotal in aviation as they can significantly impact visibility, crucial for safe takeoffs and landings. Therefore, "Mist and fog" accurately encompasses both "BR" and "FG," as they describe weather conditions involving visibility impairments caused by moisture in the atmosphere.

The other options refer to specific weather conditions that do not apply universally to both "BR" and "FG." Heavy fog is a more specific condition related mainly to "FG," while blizzard conditions relate to snow rather than mist or fog. Clearing weather indicates the absence of significant visibility-reducing weather phenomena, contrasting sharply with the conditions described by "BR" and "FG."