1. AIR Where should we place the collectors? The students worked in groups and presented their proposals. Collecting: At five various locations in the schoolyard (see map). Between 21-23 January for 48 hours. Weather: Neither rain nor snow, southeasterly weak wind.

2. Placement of the collectors

3. Two collectors at location 3, the small children´s playground.

4. And now we count particles! 1,2,3,4…………….and the average.

5. A photo taken by a mobile phone in the microscope. Look! There it is - a particle much smaller than a millimeter

6. Results of Airborne Particulates Collecting The majority of the particles are smaller than 1 mm long and most of them are white. Collecting sites: 1) 15 particles/cm 2 0,3 particles/cm 2 /h 2) 4 particles/cm 2 0,1 particles/cm 2 /h 3) 14 particles/cm 2 0,3 particles/cm 2 /h 4) 5 particles/cm 2 0,1 particles/cm 2 /h 5) 6 particles/cm 2 0,1 particles/cm 2 /h

7. We think the buildings are rather well placed. At location 1 (see map) many parents drop off their children (with car) and we think that is why there are a lot of particles there. We also think that is why there are so many particles at location 3. Location 3 is the little children´s playground and this may be a problem. Our solution is that the parents can drop their children at the parkinglot on the other side of school. Then the playground is protected by a building, so it won´t get so many particles there. Our suggestion is to plant many trees at location 1 to stop the particles. At location 4, we put up a 2 m high windbreak between and in front of the buildings. The students can also use it as graffiti boards.

8. Higher buildings around the playground, location 3. We think it would be good if there was a larger distance between the buildings and the roads, and with some trees in between. Location 4, in front of the opening between the houses we will plant trees and bushes. Like a small forest to stop the particles. Plantations with trees and bushes on the roofs of the lower buildings. This will force the wind to go higher, over the trees. All plants will also make more oxygen to the children, better air!