Hourly Metrics

Pollutants that are measured hourly (Observation Type = Hourly), such as ozone, sulfur

dioxide, carbon monoxide, and others, must be characterized by a daily metric, which

mathematically summarizes the hourly observations.

Table 4-2 lists some of the ways that metrics can be generated from hourly values. Note that

these metrics are not arbitrarily chosen, and instead match the metrics used in epidemiological


The Hourly Metric Generation portion of the Pollutant Definition window lets you define the

metrics that you want to use. There are three tabs that you may choose: Fixed Window,

Moving Window, and Custom.

The Fixed Window tab lets you define simple metrics which are calculated as statistics over a

fixed window of hours (Start Hour and End Hour) within each day. The Start Hour should be

less than or equal to the End Hour, and both can range from 0 to 23, where 0 stands for the

period 12:00 am to 12:59 am, and 23 stands for 11:00 pm to 11:59 pm. The Statistic includes

the Mean, Median, Max, Min, and Sum. Some examples follow:



n251 - n252 - n253 - n254 - n255 - n256 - n257 - n258 - n259 - n260 - n261 - n262 - n263 - n264 - n265 - n266 - n267 - n268 - n269 - n270 - n271 - n272 - n273 - n274 - n275 - n276 - n277 - n278 - n279 - n280 - n281 - n282 - n283 - n284 - n285 - n286 - n287 - n288 - n289 - n290 - n291 - n292 - n293 - n294 - n295 - n296 - n297 - n298 - n299 - n300


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