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How to Monitor Atmospheric Haze

Atmospheric haze is so common on hot summer days that most people take it for granted. However, haze presents serious health risks, especially for those with respiratory conditions. Haze is composed of tiny particles of pollution, such as the exhaust from car engines. Sunlight interacts with these particles, creating a low-hanging blanket of brownish mist. Distant objects that would otherwise be visible are obscured. Carefully monitoring haze is a good idea, especially if your airways are particularly sensitive.

Things You'll Need

Sun photometer
Notebook

Instructions

- 1
  Determine a schedule for taking haze readings. Mid-morning, early afternoon and late afternoon are possible times for monitoring the atmosphere. Plan to take readings at close to the same time every day.
- 2
  Point a sun photometer directly at the sun to take a measurement. Record the measurement in your notebook. Haze diffuses sunlight, so lower readings will indicate greater haze. Of course, don't attempt a reading when clouds or bad weather interfere.
- 3
  Make qualitative notes in addition to the scientific haze readings. Describe how the sky and the light appear to your eyes. Describe how the air feels. Heavy, thick, and soupy are some of the adjectives that might apply to a hazy day.
- 4
  Look back through your notebook after a few weeks of taking measurements. See if you can uncover any patterns that help you predict a day's eventual haziness. You may be able to better plan your activities so as to avoid the worst conditions.

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