tailieunhanh - Air pollution by ozone across Europe during summer 2009
Although particle levels have declined substantially since the 1970s, particle pollution has shown no discernible trend over the last decade. The Air NEPM 1-day standard for PM10 is 50 µg/m3 and is not to be exceeded more than five times a year at any one site. The number of allowed exceedences takes into account bushfires and similar natural events and necessary bushfire hazard reduction burning. In 2001, exceedences occurred on 8 days in Sydney and 5 days in both the Lower Hunter and the Illawarra. Bushfires are responsible for most occurrences of high levels of particulate pollution. Occasionally, widespread dust. | EEA Technical report I No 2 2010 Air pollution by ozone across Europe during summer 2009 Overview of exceedances of EC ozone threshold values for April-September 2009 ISSN 1725-2237 B__ European Environment Agency I EEA Technical report I No 2 2009 Air pollution by ozone across Europe during summer 2009 Overview of exceedances of EC ozone threshold values for April-September 2009 B__ European Environment Agency
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