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Border Air Quality Data - How To Select...

What Are Selection Criteria ?

Before producing a report of U.S.-Mexico border air quality data, you need to specify what data should be selected and presented. For example, you would choose which pollutants to include. We refer to options such as this as report selection criteria.

Each border air quality report has a selection criteria Web page that lists the particular options available, which vary from report to report. The Web page also indicates which criteria you must specify, and which ones are optional.

How Do I Specify Report Criteria ?

Border air quality Web pages display report selection criteria using lists, checkboxes, and radio buttons. These standard Web page elements allow you to see what options are available, and to choose among them.


A selection list displays a set of options (values) available for you to choose. A list can present numerous choices compactly, but you may need to scroll the list to see all of them. There are two selection list styles, single and multiple, illustrated by the examples included near this paragraph.


With the "Single" list style, you select one of the available choices. The selected choice is visible. Clicking your mouse pointer on the small arrow (triangle) expands the list and makes additional choices visible. Clicking on a choice selects it, collapses the list, and displays the selected choice. (Keyboard alternative: use up and down arrow keys to scroll the list until the desired choice is displayed.)

The "Multiple" list style lets you select any number of the available choices: none, some, or all of them. A scroll bar beside the choices allows you to scroll the list, if all choices are not visible. Clicking your mouse pointer on a choice selects it and unselects all other choices. (Keyboard alternative: use up and down arrow keys to scroll to a choice.) The selected choice is highlighted, usually with a different background color.
- To select an additional choice, or to deselect a choice, hold down the Control key (Windows) or Command key (Macintosh) while clicking on a choice.
- To select a contiguous group of choices, click on the first choice, hold down the Shift key, and click on the last choice. (Keyboard alternative: hold down the shift key while scrolling to select a contiguous group of choices.)


A checkbox provides a yes/no choice. A visual checkbox indicator (square) usually contains a checkmark or "x" to indicate yes (selected), and is empty to indicate no (unselected). The checkbox examples near this paragraph illustrate both states. Click your mouse pointer on a checkbox to toggle its state from no to yes, yes to no. (Keyboard alternative: Tab to a checkbox and press Space bar.)    Selected


Generally, border air quality Web pages use checkboxes in the same way as multiple-style lists (above). The checkboxes let you select all, some, or none of a related group of options.

Radio Buttons

A radio button allows you to choose one of a group of options. In this respect, a radio button is similar to a single-style list (above). Border air quality Web pages generally use radio buttons when there are only two or three choices for an option.

   Radio Buttons

A visual radio button indicator (circle) contains a dot or is filled with a dark shade to indicate the selected state, and is empty in the unselected state. The radio button examples near this paragraph illustrate both states. Click your mouse pointer on a radio button to select the associated choice. (Keyboard alternative: Tab to a radio button and press Space bar, or Tab to a radio button group, and use up or down arrows keys to select among buttons in the group.)

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