Using large amounts of data to pinpoint problems to the hyper-local is part of the fantastic potential of big data. Data can be used to both proactively warn of immediate health concerns as well as discover causes and solutions over longer periods of time.
Here's a project backed by IBM in Louisville, Kentucky, USA, using a pool of data collected at the individual level from asthma sufferers.
The long-term potential here is fantastic. There's really something big in the air now.
For those looking to network with Chinese mobile players and understand the market: the kind producers of the Global Mobile Internet Conference 2013 and the extended "G-Trip" contacted me to share a 25% discount code with any readers who might wish to attend. You can register your attendance at http://beijing.thegmic.com/register/ and paste in the following code into the "discount code" section: GMIC-VQ9596MT
GWIC. Be there. And see see Tiananmen Square.