[kepler-dev] Ozone warning current and warning levels

[Bertram Ludaescher]

>>>>> "DH" == Dan Higgins <higgins at nceas.ucsb.edu> writes:
DH> 
DH> Bertram,
DH>     Check out
DH> http://www.arb.ca.gov/aqd/aqinfo.htm
DH> 
DH> for hourly info on ozone and other pollutants for various spots in Ca. 
DH> PPM (or PPB - parts per billion) seems like a good unit to me. To 

only if you have all of the stuff below (pressure, temp, vapor..) 

or maybe PPM/PPB are better units, if you know what's HEALTHY (or
definitely unhealthy). Googling quickly I found threshold values in
microgram per m^3, but not in PPM...

DH> convert to mass per unit volume, one needs the air density (which 
DH> depends on pressure, temperature, water vapor, etc.).  So can a Kepler 
DH> ontology figure all this out?!
DH> 
DH> (Or just give up the idea of jogging in Southern Califormia :-) )

Lots of people do it here, so it must be good.
(famous last words of a lemming ;-)

Bertram


DH> 
DH> Dan Higgins
DH> 
DH> Bertram Ludaescher wrote:
DH> 
>> Hi:
>> 
>> On a sunny day like this I ask myself is it healthy to go for a jog or
>> not (and I'm always looking for reasons not to ;-)
>> 
>> Can someone tell me where I find the current ozone readings say for
>> San Diego? Live data streams and all that jazz...
>> 
>> For example, I found this:
>> http://www.sdapcd.co.san-diego.ca.us/air/data/8hour_web.txt
>> 
>> First I note that 8h averages are of course a bit euphemistic: when I
>> run for an hour and the peak is right then, I won't feel the effect of 
>> an 8 hour average ;-)
>> 
>> Also: What kind of strange unit is PPM? I guess parts per million. 
>> But how do I compare this to the values that I find elsewhere, for
>> example on several European pages I found "microgram / m^3". 
>> How do I go from PPM to the latter??? Figure out the density, pressure 
>> etc of air? The same for ozone? Man... complicated..
>> 
>> Unit converters to the front!! Give us the equations!
>> 
>> Bertram
>> 
>> PS yes, that makes a nice Kepler workflow too: send me a message to my 
>> cell phone when the 3 hour average lies above the "warning level". Of
>> course the averaging should be done in Kepler... piece of cake...
>> _______________________________________________
>> kepler-dev mailing list
>> kepler-dev at ecoinformatics.org
>> http://www.ecoinformatics.org/mailman/listinfo/kepler-dev
>> 
>>