Presentation is loading. Please wait.

Presentation is loading. Please wait.

Demystifying the W126 Statistic National Air Quality Conferences Raleigh March 16, 2010 David Mintz US EPA, Office of Air Quality Planning and Standards.

Published byElfrieda Mitchell Modified over 8 years ago

Similar presentations

Presentation on theme: "Demystifying the W126 Statistic National Air Quality Conferences Raleigh March 16, 2010 David Mintz US EPA, Office of Air Quality Planning and Standards."— Presentation transcript:

1 Demystifying the W126 Statistic National Air Quality Conferences Raleigh March 16, 2010 David Mintz US EPA, Office of Air Quality Planning and Standards

2 Reasons to know W126 Sudoku is “out”, W126 is “in” Impress your Facebook friends It’s important for plants It’s really simple… really

3 How do I calculate it Transform Add 3 times Average

4 Start with hourly values 12-hour period 8am-8pm

5 Transform Transform the hourly values Cheat sheet: The formula is preprogrammed in Excel at http://www.epa.gov/ttn/analysis/w126.htmhttp://www.epa.gov/ttn/analysis/w126.htm

6 Add Add the weighted hourly values for each day  Daily Value

7 Add Add the daily values for each month This example is just May  Monthly Value

8 Add Add the monthly values for each 3-month period 19.22134.072 42.691 38.26026.5493-Month sum 1.3024.36413.55516.15312.9839.1244.442Monthly Value OctoberSeptemberAugustJulyJuneMayApril 19.22134.07238.26026.5493-Month sum 1.3024.36413.55516.15312.9839.1244.442Monthly OctoberSeptemberAugustJulyJuneMayApril 3-month sums In this example, there are five 3-month sums in the year

9 Average Average the highest 3-month sum from each of the three years Year 2004AprilMayJuneJulyAugustSeptemberOctober Monthly Value4.4429.12412.98316.15313.5554.3641.302 3-Month sumna 26.54938.26042.69134.07219.221 Year 2005AprilMayJuneJulyAugustSeptemberOctober Monthly Value3.1147.2148.2148.1117.4557.3315.115 3-Month sumna 18.54223.53923.78022.89719.901 Year 2006AprilMayJuneJulyAugustSeptemberOctober Monthly Value4.5745.9786.7868.2145.5794.3312.115 3-Month sumna 17.33820.97820.57918.12412.025 W126 value = (42.691 + 23.780 + 20.978)/3 = 29.149666… rounds to 29 ppm-hours  This is it!!!

10 Congratulations! Now you know how to calculate the W126 statistic! For additional information, including data summaries, see http://www.epa.gov/ttn/analysis/w126.htmhttp://www.epa.gov/ttn/analysis/w126.htm

Download ppt "Demystifying the W126 Statistic National Air Quality Conferences Raleigh March 16, 2010 David Mintz US EPA, Office of Air Quality Planning and Standards."

Similar presentations

4.3: HOW ATOMS DIFFER ATOMIC NUMBER

4.3: HOW ATOMS DIFFER ATOMIC NUMBER
About Functions SUM, AVERAGE, MIN, MAX, COUNT, ROUND

About Functions SUM, AVERAGE, MIN, MAX, COUNT, ROUND
1. Write an Excel formula in cell Survey

1. Write an Excel formula in cell Survey
Basic Spreadsheet Functions Objective 4.01. Functions are predefined formulas that perform calculations by using specific values, called arguments, in.

Basic Spreadsheet Functions Objective Functions are predefined formulas that perform calculations by using specific values, called arguments, in.
Building a Key Performance Indicator Report Using MS Excel Texas Association for Institutional Research Annual Conference March 03, 2009 Bao Huynh, Director.

Building a Key Performance Indicator Report Using MS Excel Texas Association for Institutional Research Annual Conference March 03, 2009 Bao Huynh, Director.
$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.
1 Finding the Sample Mean  Given: The times, in seconds, required for a sample of students to perform a required task were: 6,  Find the sample mean.

1 Finding the Sample Mean  Given: The times, in seconds, required for a sample of students to perform a required task were: 6,  Find the sample mean.
 Often times meteorologists and climatologists to make some calculations in order to better understand trends in the weather. Here are three calculations.

 Often times meteorologists and climatologists to make some calculations in order to better understand trends in the weather. Here are three calculations.
Variability Measures of spread of scores range: highest - lowest standard deviation: average difference from mean variance: average squared difference.

Variability Measures of spread of scores range: highest - lowest standard deviation: average difference from mean variance: average squared difference.
Sales Forecasting “All planning begins with a forecast.”

Sales Forecasting “All planning begins with a forecast.”
$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.
SECTION 7.2 ARITHMETIC SEQUENCES. (a) 5, 9, 13, 17, 21,25 (b) 2, 2.5, 3, 3.5, 4, 4, 4.5 4.5 (c) 8, 5, 2, - 1, - 4, - 7 Adding 4 Adding.5 Adding - 3 Arithmetic.

SECTION 7.2 ARITHMETIC SEQUENCES. (a) 5, 9, 13, 17, 21,25 (b) 2, 2.5, 3, 3.5, 4, 4, (c) 8, 5, 2, - 1, - 4, - 7 Adding 4 Adding.5 Adding - 3 Arithmetic.
$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.
$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.
$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200.

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200.
Revisions to NAAQS –Data Handling and Interpretation NO 2 /SO 2 Update AQS Conference Colorado Springs June 2010 Rhonda Thompson US EPA, Office of Air.

Revisions to NAAQS –Data Handling and Interpretation NO 2 /SO 2 Update AQS Conference Colorado Springs June 2010 Rhonda Thompson US EPA, Office of Air.
$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.
BUS250 Seminar 4. Mean: the arithmetic average of a set of data or sum of the values divided by the number of values. Median: the middle value of a data.

BUS250 Seminar 4. Mean: the arithmetic average of a set of data or sum of the values divided by the number of values. Median: the middle value of a data.
$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.
$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300.

Similar presentations

Ads by Google