Shop Windows to the Universe

Science, Evolution, and Creationism, by the National Academies, focuses on teaching evolution in today's classrooms. Check out the other publications in our online store.

    Courtesy of Alison Lehnherr-George

From: Alison Lehnherr-George
T1, March 12, 2006

Changing the Filter

In this photo, Luz Padro is changing the filter on an instrument called a Hi Vol. This filter collects PM 2.5, which means it collects particulate matter that is less than 2.5 microns. Luz is interested in particles this size because they are small enough to breathe in and can be very harmful to your health. The filter is white before it is placed in the instrument; however, after twelve hours of collection, the filter has turned a dark grey color. This grey dust that has accumulated on the filter is what we are breathing in when we are down here in Mexico. As you can see, the air is very dirty! Luz stores the filters in the freezer until she returns to Georgia Tech. At her lab there, she will analyze the particulates on the filter.

Air Pollution Affects Plants, Animals, and Environments

You might also be interested in:

Cool It! Game

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

Light extinction of particles

Not all particles are the same, many of them have different shape, size, and composition. Some of them reflect or scatter light, and others absorb it. Two instruments on the image, photometer and nephelometer,...more

What does Tecamac mean?

Measuring site T1 is in Tecámac. This is a little town close to Mexico City. The name Tecámac is a Náhuatl word, an ancient Mexico's language, spoken by Aztecs. In Náhuatl, Tetl or Tec means stone, camatl...more

Peroxides Measured at the T1 Site

Hello again: We are nearing the end of our field campaign in Mexico. It has been a real adventure, with friendly people, great food, and interesting science. I obtained some good hydrogen peroxide measurements...more

Cerro del Chiquihuite

Here is an example of how polluted the City is. This is a picture of "Cerro del Chiquihuite", which is situated around 5km (3miles) north from us. Chiquihuite is very close, indeed. However, we can barely...more

Ruins at Zempoala

On one of our down days, we took a little trip to a small town about 20 km from Veracruz. In the little town of Zempoala (also called Cempoala), there is a large area of partially restored ruins of ancient...more

T0

This is a picture of the site where I am going to be measuring particles (I am in the room on the top of the building). We call it T0 because it is inside of the city and we can consider that the pollutants...more

Boxes

Our boxes crossed the border yesterday and, after a 15 hours drive from Laredo, finally arrived this morning! The fun begins!!...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF