What is the stability class referred to as 'F' likely to exhibit during nighttime conditions?

The stability class referred to as 'F' indicates strong stability, particularly during nighttime conditions. In this context, strong stability means that the atmosphere is resistant to vertical mixing. This often occurs during the night when the ground cools and cool air becomes trapped under warmer air above, creating a temperature inversion. Under such conditions, pollutants emitted from sources at the surface are likely to remain close to ground level, leading to poor dispersion of contaminants.

In summary, stability class 'F' is characterized by a situation where the atmosphere suppresses vertical movement, which results in strong stability. This has implications for air quality as it affects how pollutants disperse in the environment, often leading to higher concentrations of these pollutants near the surface where people live and breathe.