Air Graphing Instructions
- Plots are selected from List 1 and List 2. These 2 lists determine how stations
and parameters are selected --- stations first....then parameters OR parameters
first .... then stations. To change the order of the lists, use the 'Select'
options above list 2. Clicking on a selection in List 1 determines what selections
are available in List 2. Not all items are available at every station, and in fact stations are sited differently depending on the pollutant. Clicking
on an item in List 2 (or clicking 'Add selection' will add the
station-parameter combination to the grid and chart. Items added to the grid
will remain on the grid and chart until the user deletes an individual item or clicks
the 'Clear grid' button. Clicking 'Add all items'
will add all of the items in List 2).
- The date-time duration is initially set at 7 days with the ending date defaulting to today's
date . The date-time interval can be changed by changing the selections on 'Start Date' and 'End Date'. Dates can be selected
either by typing a date in the textbox or by opening the control and navigating
through the calendar selections (users must click on a specific day to actually
select a date.....selecting just a year and month is not sufficient).
- Group selections: To allow users to easily focus on sites in their particular
area of interest a dropdown list is available that offers selections based on particular
regions of Washington State so that only those sites will be displayed in List 1
- All Parameters, All Stations These are here to allow the
user to return to the default lists without going to the 'Select Station' or 'Select
- Puget Sound North, Central, South
- Olympic Peninsula, Southwest Wa
- Central Wa, Northeast Wa, Southeast Wa
- Woodsmoke Puget Sound A selected set of stations that are
closely monitored during the winter because of wood smoke emissions.
- Ozone West A selected set of stations that are monitored
during the summer for ozone concentrations in western Washington.
- Grid features: The default grid view opens in the 'Select Hour - Day
The 'Display AQI Category' is enabled only if all the parameters
in the grid are the same AQI type (with the
correct averaging period). If a category is selected, the background of the plots will display the AQI categories for the selected item. (Note: If "AQI" is selected as an averaging period and you choose to display AQI categories the selection will be forced to "AQI units".
The default y-axis scaling is auto-scaling. To manually change the scaling, click the "Up" or
The 'View Grid of Plotted Data' button will display in a separate
grid, all of the values that make up each trace in the chart display.
The two buttons 'Create Plotted Data File' and 'Download
Plotted Data File' will save all of the values that make up each trace
in the chart display to a .csv or .xml file to a user's PC.
- The default averaging base for most parameters is 1-hour
average. All of the items in the grid can changed to a different averaging
base simply by clicking on the checkbox column header (Av8Hr,
Av24Hr, Day, etc.) The majority of data that
is sampled is collected as hourly averages. Some sampling (called Daily) is
collected for a continuous 24-hour period from midnight-to-midnight and is archived
as 24-hour averages. 'Daily' parameters will not have 1-hour or 8-hour averages
and their checkbox will default to 'Av24Hr'. NOTE: The 8-hour and 24-hour
averages are simple moving averages and are posted based on midpoint-averaging.
For example, for hour 6 the 8-hour average is for the 4-hours ending at 6
plus the 4-hours after 6. The 24-hour moving average for a day (beginning
and ending at 12 midnight), is posted at 12 noon, and includes the 12-hours ending
at noon and the 12-hours after noon.
- Users have the option to display simultaneous multiple averages for the same station-parameter.
An easy way to accomplish this is to click several checkboxes in a row (Av1Hr, Av8Hr,
Av24Hr) and then click the 'Update' link in the grid header.
This will create a separate row for each average.
- For longer averaging periods that include "Month", "Quarter", and "Year", a separate
grid header link titled 'Select Month - Year Avgs' is available
and the checkboxes function like the those in the 'Select Hour - Day Avgs'.
Be aware that if 'Month' is selected that the chart will only display
the month value unless the 1st day of the month is included in the date range.
The same will be true for 'Quarter' selections, e.g. Jan 1, Apr
1, Jul 1, Oct 1 and for 'Year' Jan 1.
- For each item in the grid, the average, maximum, and minimum of the displayed data
are shown in the last 3 columns. This particular feature allows the viewer
to quickly scan the Avg column to detect if data is missing (the
Avg will not display a value unless 75% of the data is available for the date range.
- The grid can be sorted by clicking on any column header (eg. Max).
This can be useful when trying to identify high (or low) values from a number of
stations. A first click on a header will sort in ascending order, and a second
click will sort in descending order. The chart display (traces and legend)
will also be sorted.
- Clicking the grid header link 'Daily Stats' displays the 4-highest
daily values of the selected average for the date range.
- Clicking the 'Daily Stats' link reveals another grid header link
'Pm & Ozone Stats'. The values shown (if any) for each
row depend upon the parameter for that row. If the parameter is Pm2.5 the
values shown will be the "98th Percentile for Pm2.5", if Pm10 the values will be
"99th Percentile for Pm10", or if Ozone the values will be "4th High 8-Hour Average
for Ozone". NOTE: The date range for the 3-year period is determined by the
year value displayed in the 'End Date' control. Values displayed
in red indicate that sampling was incomplete.
- A grid header link titled 'Export to CSV' is available whenever
'Daily Stats' or 'Pm & Ozone Stats' links
and will save the grid contents being displayed to a file.