--> How are pollutants such as ozone, NOx, VOCs and particulate matter transported or moved away from their sources?
- Review the wind information
below. Remember that the wind barb points in the direction where the wind is
blowing to, as opposed to where the wind is blowing from.
NOTE: The Example Wind Barb above represents a wind that is blowing from
the Southeast at 15 knots. Wind speed is often reported in the units of
"knots". A "Knot" is a nautical mile per hour.
- 1 Knot = 1.15 Miles Per Hour (MPH)
- 1 Knot = 1.9 Kilometers Per Hour (KM/HR)
- Each short barb represents 5 knots, each long barb 10 knots. A long barb
and a short barb is 15 knots, simply by adding the value of each barb
together (10 knots + 5 knots = 15 knots.
- If you would like more wind barb practice, try this online quiz.
- On your
Student Worksheet, analyze the wind barbs and determine which way
the wind is blowing and how hard the wind is blowing.
- Wind not only moves air, but also particles and objects that may be in
the air. You may have experienced this before if you have dropped a piece of
paper outside on a windy day and chased after it as the wind picks up the
paper and carries it along.
- What about the particles you cannot see? Winds can transport particles
like NOx, VOCs, ground level ozone and particulates great distances from
where they were produced.
- Pollutants such as ground level ozone and particulate matter are usually
swept along by winds that blow around 3,000 ft above the surface (sea level).
3,000 ft wind data or
the WeatherUnderground or surface wind streamlines and answer the questions on the
Think about diesel exhaust and how all of these pollutants may be transported into your area. Now, think about the role of weather in this equation. Has the weather been such that it will effect the level of pollutants in the surrounding air? Combining all of this information, do you think you will be able to see the pollution or haze in the air today in Hartford? Explain.
- There are times when you can see the pollution in the air, when the air looks
brownish-orange, that is called haze. Haze is caused by fine particles that scatter and absorb light. As the number of fine particles increases, more light is absorbed and scattered, resulting in less clarity, color, and visual range.
Check your response. Use NESCAUM's Haze Cam to determine if your
hypothesis was correct. Notice the real time information under the image. Is the information similar to what you were expecting? Why or why not?