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发布于:2018-3-9 11:32:55  访问:8 次 回复:0 篇
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The Planets Leading Six Most Essential Etoposide Secrets
5 increases on Independence Day starting at 8 pm. The four control days, spanning the same hours, begin at 8 pm on July 2, 3, 5, and 6. We include any particular year for a given station only if data are available for every hour of every day in the analysis period for that year, and we require at least three such years for each station. These requirements are designed to minimize the influence of year-to-year variations Etoposide in background PM2.5, allow a fair comparison of results for different hours of the day, and balance the desire for a large set of stations with the desire for a large sample of years. Of the 315 sites meeting these criteria, 61 have ��PM2.5 Local Conditions�� data and the other 254 have ��Acceptable PM2.5 AQI & Speciation Mass�� data. In 14 instances, both data types are available, and, although each is categorized as a separate station, we consider them co-located and compare results from the two data types. The spatial distribution of sites (Fig.?1) reasonably covers the US but is biased toward population centers and shows clustering of sites in some urban areas. For each station, we compare PM2.5 on Independence Day and control days, using both daily-average and hourly-average PM2.5 data. In both cases, we have n values for Independence Day, where n is the number of years of data available, and 4n values for control days. To test the null hypothesis that average PM2.5 concentrations are not significantly greater on Independence Day than during the control period, we employ a one-tailed Roxadustat ic50 t-test, assuming unequal variances and unequal sample sizes, and requiring p?PTPRJ values (starting at 8 pm, 20 LST) on Independence Days and control days. On early July control days, hourly values vary between ?11 and 14?��g/m3, with standard errors <1?��g/m3. There is a suggestion of a diurnal variation with two concentration peaks per day, one before midnight and the other just after sunrise. The 24-hr average is 12.0?��g/m3, about one-third of the NAAQS daily standard of 35?��g/m3. In contrast, during the 6-hr period beginning 20 LST on July 4, hourly PM2.5 values are elevated to between 20 and 35?��g/m3. The national-average, 24-hr-average Independence Day concentration is 17.0?��g/m3, or 5?��g/m3 (42%) higher than on control days and about one-half of the NAAQS value. Fig.
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