Dew point: the number that says it's sticky
Relative humidity is relative to temperature. Dew point is absolute. If you want to know whether the air is "muggy," dew point is the number.
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Apparent temperature: what your body feels
The thermometer reading is just the air. Heat index and wind chill account for humidity and wind: closer to what your body experiences.
Aerosol Optical Depth
What satellites see when they look at our atmosphere. Aerosol Optical Depth quantifies how much sunlight gets scattered or absorbed by particles, and it lines up with ground-level PM in useful ways.
Visibility as air quality
How far you can see is a rough but useful gauge of how much fine particulate is in the air, as long as the air is dry.
