My girlfriend had a life-threatening asthma attack last year that involved last minute resuscitation in a hospital emergency room. The most frightening experience of my life.I understand all about the pollution - I'm allergic to it.
Outside Hong Kong she doesn't even get minor asthma symptoms. And she's FROM HK.
I know many people who have left the place because their children get asthma here they don't get anywhere else. The conductor of the HK Philharmonic relocated his kids outside of HK because they developed asthma here. And it's hardly the plant life causing it.
Dismal light is probably the least of the issues.
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“There is only you and your camera. The limitations in your photography are in yourself, for what we see is what we are.” Ernst Haas
http://garyp.zenfolio.com/p518883873/