Air quality guidelines - global update 2005
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Doc #: 10 Title: WHO Air quality guidelines - global update 2005 | Document Link
Document Status: Unsubmitted, 2009/08/31
- PM2.5/PM10 - 24-hr mean; annual mean
- O3 - 8hr mean
- NO2 - annual mean
, 1-hr mean
- SO2 - 24 hr mean, 10 min mean
Description of Document: WHO AQ Guidelines ( Similar to AQ Standards) update for PM2.5/PM10, O3, NO2 and SO2 worldwide based on literature/research concerning health effects.
Addition of PM2.5 to measurements was new. Currently, most countries only measure PM10, however PM2.5/PM10 ratio is needed. UF particle measurements are insufficient as well.
Ozone correlates with other toxic photochemicals
NO2 has health effects on its own; is a marker for other toxics and is a precursor for O3
SO2 has health effects at high concentrations after just 10 minutes, but may be surrogate for UF particles.