Air Quality Flag
PROGRAM
Air Quality Flag Program
Coordinator Handbook
United States
Environmental Protection
Agency
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Air Quality Flag Program Coordinator Handbook
U.S. Environmental Protection Agency
Office of Air Quality Planning and Standards
Research Triangle Park, North Carolina
Thank you for being an Air Quality Flag Program Coordinator. We hope
that you find this handbook helpful, and are open to any suggestions you
may have to improve it. Questions about the Air Quality Flag Program
should be directed to your state air quality agency or to Donna Rogers,
at rogers.donna@epa.gov.
Publication No. EPA-456/B-I5-OOI
May 2015
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Table of Contents
Overview of the Air Quality Flag Program page 2
Steps for a Successful Air Quality Flag Program page 3
Background page 8
Overview of the Air Quality Flag Program
The Air Quality Flag Program uses brightly colored flags to help a community be aware of daily air
quality conditions. The flag colors correspond to the colors used in EPA'sAir Quality Index (AQI),
which tells how clean or polluted the air is for that day. When community members know the daily air
quality, they can adjust their activities to reduce their exposure to air pollution. Regular physical activity
- at least 60 minutes a day - promotes health and fitness. The purpose of the Air Quality Flag Program
is to help people continue to exercise and work outside while protecting their health when the air
quality is unhealthy.
Each day, communities raise a brightly colored flag that corresponds to the local air quality forecast:
green
Green flag - good air quality
yellow
Yellow flag - moderate air quality
orange
Orange flag - unhealthy for sensitive groups (including children and people with
heart or lung diseases, like asthma, older adults, and adults who are active outdoors)
Red flag - unhealthy for everyone
Purple flag - very unhealthy for everyone
Note: There is a sixth color ~ maroon ~ used in EPA'sAir Quality Index. It indicates hazardous air quality. It is
not included in the school flag program since it is rare and will trigger health warnings of emergency conditions
from local media.
Air quality can become unhealthy due to pollutants such as ground-level ozone and particle pollution.
Ozone is especially damaging to the lungs of children and those who work and play outside. Particle
pollution can be so small that it gets deep into the lungs and causes serious health problems. Children
(including teenagers) are at greater risk from air pollution because their lungs are still developing and
they breathe more air per pound of body weight than adults. Other groups at greater risk include
people with asthma or heart disease, older adults, and those who are active outdoors. These groups
can continue to stay active even when air quality is unhealthy by modifying their activities or, in some
cases, moving their activities indoors.
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This handbook describes the four steps a Program Coordinator needs to take to implement a
successful program:
I. Purchase flags
2. Educate and inform the school and the community at the start of the program
3. Find out the daily air quality forecast and fly the corresponding flag
4. Know what actions to take when the air quality is unhealthy
The Air Quality Flag Program can be a great way to teach people about their local air quality, how air
pollution impacts health, and what actions we can take to protect ourselves. You'll find more information
about the flag program, the AQI, ground-level ozone and particle pollution, and the health effects of air
pollution in the Background section of this handbook
Steps for a Successful Air Quality Flag Program
Step I; Purchase flags
You can buy a set of flags through a local flag vendor, or you can find vendors online. For schools,
sometimes sponsors such as parent teacher organizations, a local environmental organization or a
community business may be able to help purchase the flags.
You will need five flags: green, yellow, orange, red, and purple. The purple flag might be needed only
on rare occasions, but it is important to have if there is an air quality alert due to a wildfire or other
serious air quality episode. There are some suggested color names and PMS (pantone matching system)
numbers that your flag vendor may recognize. If you cannot get these exact colors, any similar green,
yellow, orange, red, and purple will do. The nylon flag colors are called #349 Irish Green (PMS 3415c),
#108 FMYellow (PMS I02c),#l5l Golden Poppy (PMS I5lc),#485 Canada Red (PMS I86c),and #2627
Pansy (PMS 2627c).
The flag is pennant style and the dimensions are 3'x 5'. You may choose plain flags or flags with logos,
graphics, or words (note that extra printing on the flags will cost more and may not be visible once the
flag is raised on the flagpole). A set of five flags usually costs around $100.The price often goes down if
you order a large quantity of flag sets at the same time, which could be beneficial to school districts.
Flying the flag: If you have a flag pole, fly the flag under any other flags you use. If you don't have a flag
pole, try a portable flag pole, wall bracket, or a flag hanger that attaches over a door.
Step 2; Educate and inform your community at the start of the program
Choose a date to begin flying your flags, and then begin to educate and inform your organization and
the surrounding community. Some suggestions on when to start are Earth Day (April 22) or Air Quality
Awareness Week (the first week in May, which is the beginning of the ozone season in many areas), but
any date will do.
Register your organization on EPA's Air Quality Flag Program website (www.airnow.gov/flag). EPA will
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add your organization to the online table of participants and send you an official certificate for display.
Train your colleagues about the AQI and the flag program so they can help administer the program and
teach others. Take advantage of the many resources available on the Air Quality Flag Program website
at www.airnow.gov/flag. These include:
• a fact sheet
• a poster to use in schools
• guidelines for outdoor activities when the air is unhealthy
Announce your program to your community through newsletters, emails, flyers, and other outreach
materials.
EXAMPLE EMAIL
Subject: NEW --Air Quality Flag Program
How much pollution is in the air outside today? Soon, our entire [organization] will have a simple
way to find out... Just look up at the flag pole! We have joined the Air Quality Flag Program, and
starting [insert date], we'll be flying a brightly colored flag that shows how clean or polluted the air is
each day.
The flags correspond to the colors of the Air Quality Index (www.airnow.gov). The AQI is an index
that tells you how clean or polluted the air is, and what health effects might be a concern for you at
that level. The Air Quality Flag Program will help us continue to promote exercise while protecting
health.
Every business day we will fly a flag with one of the AQI colors:
Green - good air quality
• Yellow - moderate air quality
Orange - unhealthy for sensitive groups, which includes children and teens, people with
heart or lung issues, older adults, and people who are active outdoors
Red - unhealthy for everyone
Purple - very unhealthy for everyone
On green and yellow days, we encourage people to be outside and moving. When air quality is
orange or red, it's still OK for most people to exercise and work outside, but we encourage you to
take breaks and do activities that are not as strenuous, like walking instead of running. If the flag is
purple, you might consider staying inside that day.
The U.S. Environmental Protection Agency promotes the Air Quality Flag Program across the
country, and we are proud to be involved. In addition to raising flags, we will have the chance
to learn more about air pollution, how it affects our health, and what we can do to make the air
cleaner.
For more information on the flag program, go to www.airnow.gov/flag.
We will post more information about this exciting new program and our [date] flag raising event on
our website.
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Step 3; Find out the daily air quality forecast and flv the corresponding flag
Like the weather, air quality changes from day to day. Your local or state air quality agency makes a
daily air quality forecast that predicts the AQI color for both ozone and particle pollution. The forecast
appears in late afternoon and predicts the air quality for the next day.
Here's how you can get the AQI forecast:
• Email. Sign up to get the daily air quality forecast and special alerts (such as wildfires) sent to you
by email. Go to www.airnow.gov/enviroflash to see if your city participates.
• Smart phone. Download the AirNow app, available for iPhone and Android.
• Widget. Add a simple line of code to your organization's website to have the AQI always appear
on your home page.Available at www.airnow.gov.
• Newspaper and TV. Many weather pages and weathercasts have the AQI forecast.
• AirNow.gov. The AirNow website has the AQI for hundreds of cities.
EXAMPLE: Air Quality Forecast for Anytown, USA
Today's High
Air Quality Index (AQI)
Unhealthy for
Sensitive Groups
Health Message: People with heart or lung
disease, older adults, and children should
reduce prolonged or heavy exertion.
Tomorrow's High
Air Quality Index (AQI)
D
Unhealthy
Health Message: People with heart or lung
disease, older adults, and children should
avoid prolonged or heavy exertion. Every-
one else should reduce prolonged or heavy
exertion.
AQI - Pollutant Details
Ozone 1 30 Unhealthy for
* ' Sensitive Groups
Particles (PM2.5) [ ] 57 Moderate
Particles (PM2.5) [ ]
Ozone f
1 56 Unhealthy
57 Moderate
In this example,"Today's High" is forecast to be orange (unhealthy for sensitive groups) and
"Tomorrow's High" is forecast to be red (unhealthy). The "Pollutant Details" tell you the specific
pollutant that is driving the forecast. For today, ozone is the pollutant causing the air quality color to be
orange. For tomorrow, particles (PM2.5) drive the red forecast.
Each morning, assign someone at your organization to raise the flag showing the day's AQI color. It is
a good idea for the assigned person to check the air quality forecast in the morning before the flag is
raised. Some state and local air quality agencies update the day's forecast to a different color if pollution
is worse than originally expected. If you subscribe to EnviroFlash emails, you can choose to be notified
via email of forecast updates.
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You may also see "Current Conditions" on airnow.gov or in an EnviroFlash email alert. These are air
quality values that are updated hourly. For the flag program, it is better to use Tomorrow or Today's
forecast to know which flag to fly because those won't change by the hour.
Some ideas to involve your employees/colleagues/students in the flag program:
• Encourage everyone to sign up for EnviroFlash emails if they are available in your area.
• Designate one person (or for a school, perhaps establish a team) to be in charge of checking
the forecast and raising the flag each morning.
• Add a message about the day's air quality color to any daily announcements.
• Tell people about the app and the widget to have the AQI on their phone or website. Both are
available at www.airnow.gov.
Step 4; Know what actions to take when the air quality is unhealthy
Ozone and particle pollution are the most common and widespread air pollutants. When either ozone
or particle pollution is at an unhealthy level, the chances of being affected increase the longer a person
is active outdoors and the more strenuous the activity. Since exercise is good for your health, it's
important to stay active and know when to make changes.
EPA considers certain groups to be "sensitive" because they have more health effects at lower pollution
levels. "Sensitive groups" include children and teenagers, older adults, people with heart or lung disease
(such as asthma), and people who are active outdoors.
General Actions:
• As either ozone or particle pollution levels become unhealthy, the general advice is to reduce:
(I) how hard you work or exercise outdoors, and/or
(2) the length of time you work or exercise outdoors
For example, on code orange days, it is still o.k. for children to play outside, but they should
reduce activities that involve running and take more frequent breaks.
• When pollution is present in the air, people with asthma are more likely to have symptoms
such as coughing or shortness of breath. Be alert for symptoms and follow the person's
asthma action plan. If the person has a quick relief inhaler, be sure it is always handy. Note that
even people who do not have asthma could experience symptoms when exposed to unhealthy
levels of air pollution.
Specific Actions When Ozone Pollution is at an Unhealthy Level
Ozone is formed when pollutants emitted by industrial facilities and power plants, motor vehicle
exhaust, and other sources react in the presence of heat and sunlight. Since heat and sunlight drive
ozone formation, warm sunny days have more ozone than cool or cloudy days. Ozone levels are
generally much lower in the mornings.
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Action:
• When unhealthy levels of ozone are expected, you can reduce exposure by working and
exercising outdoors before noon.
Specific Actions to Reduce Exposure to Particle Pollution
In some locations where wood is burned for heat, particle pollution levels can be especially high during
wintertime inversions. An inversion occurs when a layer of cooler air is trapped near the ground by
a layer of warmer air above. When the air cannot rise, pollution at the surface is trapped and can
accumulate, leading to higher pollutant concentrations. A variety of conditions can cause inversions to
form. The most common is a nighttime inversion, when cloudless skies allow air at the surface to cool
faster than the air above.
Actions:
• Choose areas away from busy streets to walk, exercise and work.
• Avoid standing or working near vehicles that are idling.
• Implement policies and education programs to limit idling by trucks, buses and personal
vehicles.
• If it looks or smells smoky outside, it is better not to exercise or work outside.
Use Your Judgement
You should always use your judgment when deciding how to modify outdoor activities when air quality
is unhealthy. There are three Activity Guidelines that summarize the actions to take. One is for ozone,
one for particle pollution, and one is for schools. You can find the guidelines here:
www.airnow.gov/index.cfm?action=flag program.outdoorguid
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Background
What is Ozone?
Ozone is a colorless gas found in the air we breathe. Naturally occuring ozone high above the earth's
surface protects our planet from solar radiation. When ozone is created near the ground it is unhealthy
to breathe and can also damage trees and crops.
Ozone is created at ground level by chemical reactions between oxides of nitrogen (NOx) and volatile
organic compounds (VOC) in the presence of sunlight. Emissions from industrial facilities and power
plants, motor vehicle exhaust, gasoline vapors, and chemical solvents are some of the major sources of
NOx and VOC. Because ground-level ozone needs sunlight to form, it is usually highest during the hot,
sunny days of summer, spring, and fall.
Within the last decade, however, high ozone concentrations have also been observed under specific cir-
cumstances in cold months. Specifically, there are a few high elevation areas in the Western U.S. where
high levels of local VOC and NOx emissions have formed ozone when snow is on the ground and tem-
peratures are near or below freezing. Ozone contributes to what we typically experience as "smog" or
haze, which still occurs most frequently in the summertime, but can occur throughout the year in some
southern and mountain regions.
Health Effects of Ground-level Ozone
• Constriction of airways forcing the respiratory system to work harder to provide oxygen
• Coughing, pain when taking a deep breath, wheezing and inflammation of the airways including
the deep portions of the lungs
• Increased fatigue
• Reduced athletic performance
• Aggravated lung disease
For ozone, people with lung disease, children and teenagers, older adults, and people who are active
outdoors are considered sensitive and therefore at greater risk.
What is Particle Pollution?
Particles in the air are a mixture of solids and liquid droplets that vary in size and are often referred
to as "particulate matter." Some particles - those less than 10 micrometers in diameter - pose the
greatest health concern because they can pass through the nose and throat and get deep into the lungs.
Ten micrometers in diameter is just a fraction of the diameter of a single human hair. Particles larger
than 10 micrometers do not usually reach your lungs, but they can irritate your eyes, nose and throat.
Particle pollution, unlike ground-level ozone, can occur year-round.
Very small particles with diameters less than 2.5 micrometers are called "fine" particles. They are
produced any time fuels such as coal, oil, diesel or wood are burned. Fine particles come from fuel used
in everything from power plants to wood stoves and motor vehicles (e.g., cars, trucks, buses and marine
engines). These particles are produced by construction equipment, agricultural burning, trash and brush
burning, and forest fires. In fact, forest fires (wildfires) are responsible for some of the worst particle
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pollution events."Coarse" dust particles range in size from 2.5 to 10 micrometers in diameter. Particles
of this size are produced during crushing or grinding and from vehicles traveling on paved or unpaved
roads.
Health Effects of Particle Pollution
• Increased respiratory symptoms, such as irritation of the airways, coughing, or difficulty
breathing
• Decreased lung function
• Aggravated asthma
• Development of chronic bronchitis
• Irregular heartbeat
• Heart attacks
• Premature death
For particle pollution, people with heart or lung disease, older adults, and children are considered sensi-
tive and therefore at greater risk.
What is the Air Quality Index (AQI) and How Does it Work?
The Air Quality Index (AQI) is an index for reporting daily air quality. It tells you how clean or polluted
your air is, and what associated health effects might be a concern for you. The AQI focuses on health
effects you may experience within a few hours or days after breathing polluted air.
The higher the AQI value, the greater the level of air pollution and the greater the health concern. For
example, an AQI level of 50 represents good air quality with little potential to affect public health, while
an AQI value over 201 represents very unhealthy air quality. An AQI value of 100 generally corresponds
to the National Ambient Air Quality Standard (NAAQS) for the pollutant, which is the level EPA has
set to protect public health. AQI values below 100 are generally thought of as satisfactory. When AQI
levels are above 100, air quality is considered to be unhealthy - at first for certain sensitive groups of
people, then for everyone as AQI values get higher.
Air Quality Index I Levels of Health Concern
(AQI) Values I
Colors
When the AQI
is in this range:
Good Green
Moderate Yellow
Unhealthy for Sensitive Groups Orange
Very Unhealthy
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The purpose of theAQI is to help you understand what local air quality means to your health. To make
it easier to understand, the AQI is divided into categories. Each category corresponds to a different
level of health concern. The levels of health concern and what they mean are:
Air Quality Index
Levels of Health Concern
Good
Moderate
Meaning
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Air quality is considered satisfactory, and air pollution poses little or no risk.
Air quality is acceptable; however, for some pollutants there may be a
moderate health concern for a very small number of people who are un-
usually sensitive to air pollution.
Members of sensitive groups may experience health effects. The general
public is not likely to be affected.
Everyone may begin to experience health effects; members of sensitive
groups may experience more serious health effects.
Health alert: everyone may experience more serious health effects.
For more information about theAQI see www.airnow.gov.
United States
Environmental Protection
Agency
Office of Air Quality Planning and Standards
Outreach and Information Division
Research Triangle Park, NC
Publication No. EPA-456/B-15-001
May 2015
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