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 start their
journey there, at "time zero". The pollutants are carried away from the
city by the wind and after some time ("time 1") they will reach a second
measuring site called T1. There is a third site even farther away called T2.
By measuring pollutants at the three sites, we will be able to see how
pollutants are transformed as they move way from the city.
Unfortunately, our instruments are not here yet. They are taking longer
than expected to cross the US-Mexico border. Hopefully, they are going to
be here tomorrow and we will be able to start measuring soon.