A group in San Jose California is combining art and science by releasing a bunch of urban homing pigeons into the neighborhood equipped with cellphones and air quality sensors. The pigeons, their paths and the measured pollution levels were mapped in real time and sent to a blog. The project only looked at carbon monoxide and nitrogen oxides - but these should be reasonable markers for urban pollution levels.
Some people have expressed concerns that wearing the "backpacks" might be stressful to the pigeons and also that the project is redundant because the EPA (Environmental Protection Agency) is already measuring pollution levels in the area. The group claims that the apparatus doesn't bother the pigeons (and most of the flights were a couple of hours at most in any case). In contrast to the EPA monitors, which are stationary, these birds were moving around while they collected data. From the maps on the site, it looks as if most of the birds staye fairly close to where they were released - so the results would be most useful for looking at spatial difference in pollution at a neighborhood level.
It all sounds kind of cool to me. I wonder if they looked at the pollution levels with respect to distance above the ground as well at latitude/longitude (the typical way to map dispersed pollutants) - I didn't see this on the site and don't know if it would yield interesting results or not.
PHOTO FROM THE PIGEONBLOG SITE