NWS Baltimore/Washington Air Quality

As a public service, the National Weather Service's Baltimore/Washington Forecast Office will redistribute Air Quality Forecasts produced by the Maryland Department of the Environment, Virginia Department of Environmental Quality, and Metro Washington Council of Governments.

Latest AQI forecast:

000
AEUS71 KLWX 242026
AQILWX

AIR QUALITY FORECAST
MD DEPT OF ENVIRONMENT AND VA DEPT OF ENVIRONMENTAL QUALITY
RELAYED BY NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
426 PM EDT FRI MAY 24 2013

THE AIR QUALITY FORECASTS FOR NORTHERN VIRGINIA AND FREDERICK
COUNTY VIRGINIA ARE PROVIDED BY THE VIRGINIA DEPARTMENT OF
ENVIRONMENTAL QUALITY.  THE AIR QUALITY FORECAST FOR THE DC
METRO IS PROVIDED BY THE METROPOLITAN WASHINGTON COUNCIL OF
GOVERNMENTS.  AIR QUALITY FORECASTS FOR MARYLAND ARE PROVIDED
BY THE MARYLAND DEPARTMENT OF ENVIRONMENT.

DCZ001-MDZ004-009-013-016>018-VAZ042-052>054-252000-
DISTRICT OF COLUMBIA-FREDERICK MD-MONTGOMERY-PRINCE GEORGES-
CHARLES-ST. MARYS-CALVERT-LOUDOUN-
PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-
426 PM EDT FRI MAY 24 2013

THE FORECAST SATURDAY FOR THE DC METRO AREA IS CODE LEVEL
GREEN...WHICH IS GOOD...AND MEANS LITTLE OR NO HEALTH RISK.
PRIMARY POLLUTANT WILL BE OZONE.

FOR MORE INFORMATION ON GROUND-LEVEL OZONE AND FINE
PARTICLES...VISIT WWW.CLEANAIRPARTNERS.NET.

$$

MDZ005>007-010-011-014-252000-
CARROLL-NORTHERN BALTIMORE-HARFORD-HOWARD-SOUTHERN BALTIMORE-
ANNE ARUNDEL-
426 PM EDT FRI MAY 24 2013

THE FORECAST SATURDAY FOR THE BALTIMORE METRO AREA IS CODE LEVEL
GREEN...WHICH IS GOOD...AND MEANS LITTLE OR NO HEALTH RISK.
PRIMARY POLLUTANT WILL BE OZONE.

FOR MORE INFORMATION ON GROUND-LEVEL OZONE AND FINE
PARTICLES...VISIT WWW.MDE.STATE.MD.US/AIR...OR CALL THE MARYLAND
AIR QUALITY HOTLINE AT 410-537-3247.

$$

MDZ001-003-501-502-252000-
GARRETT-WASHINGTON-EXTREME WESTERN ALLEGANY-
CENTRAL AND EASTERN ALLEGANY-
426 PM EDT FRI MAY 24 2013

THE FORECAST SATURDAY FOR WESTERN MARYLAND IS CODE LEVEL
GREEN...WHICH IS GOOD...AND MEANS LITTLE OR NO HEALTH RISK.
PRIMARY POLLUTANT WILL BE OZONE.

FOR MORE INFORMATION ON GROUND-LEVEL OZONE AND FINE
PARTICLES...VISIT WWW.MDE.STATE.MD.US/AIR...OR CALL THE MARYLAND
AIR QUALITY HOTLINE AT 410-537-3247.

$$

VAZ028-WVZ052-053-252000-
FREDERICK VA-BERKELEY-JEFFERSON-
426 PM EDT FRI MAY 24 2013

THE FORECAST SATURDAY FOR EASTERN WEST VIRGINIA...AND FREDERICK
COUNTY VIRGINIA IS CODE LEVEL GREEN...WHICH IS GOOD...AND MEANS
LITTLE OR NO HEALTH RISK.  PRIMARY POLLUTANT WILL BE OZONE.

FOR MORE INFORMATION ON GROUND-LEVEL OZONE AND FINE
PARTICLES...VISIT THE VIRGINIA D E Q AIR QUALITY WEB SITE AT
WWW.DEQ.VIRGINIA.GOV.

$$

Links

National Information: http://www.airnow.gov/

Regional Information: http://www.cleanairpartners.net/

Local Information:

• Maryland: http://www.mde.state.md.us/air/
• Virginia: http://www.deq.state.va.us/airquality/
• Metropolitan Washington: http://www.mwcog.org/environment/air/forecast/

Understanding the AQI
The purpose of the AQI is to help you understand what local air quality means to your health. To make it easier to understand, the AQI is divided into six categories:

Category	AQI	Color Code	Health Statements
Good	0 - 50	Green	Air quality is considered good, and air pollution poses little or no risk.
Moderate	51-100	Yellow	Air quality may pose a moderate health risk, especially for those who are unusually sensitive to air pollution.
Unhealthy for Sensitive Groups	101-150	Orange	Members of sensitive groups, children and adults with respiratory and heart ailments, may experience health effects and should limit time spent outside. The general public is not likely to be affected.
Unhealthy	151 - 200	Red	Everyone may experience health effects and should limit their outdoor activity; members of sensitive groups may experience more serious health effects.
Very Unhealthy	201-300	Purple	Everyone may experience more serious health effects and should avoid outdoor activities, especially individuals with heart and breathing ailments, children, and older adults.
Hazardous	301-500	Maroon	Health warnings of emergency conditions. The entire population is more likely to be affected.

National Weather Service Weather Forecast Office Baltimore/Washington 43858 Weather Service Rd. Sterling, VA 20166 Phone: (703) 996-2200 Webmaster: lwxwebmaster@noaa.gov Page last modified: May 31, 2011 4:38 PM EDT	Disclaimer About Us Credits	Privacy Policy Career Opportunities Glossary