Air Quality Index in Washington D.C

Washington D.C

Washington, D.C, is a vibrant city known for its iconic landmarks, rich history, and diverse culture. As a bustling metropolitan area, air quality in D.C. can vary significantly depending on factors like traffic, industrial activity, and weather patterns.

Air Quality Index

January 23, 2025

Moderate

Members of sensitive groups, such as children, the elderly, and individuals with respiratory conditions, may experience adverse health effects. The general population is less likely to be affected.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 24, 2025

Poor

Everyone may begin to experience health effects, and sensitive groups may face more serious issues.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 25, 2025

Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 26, 2025

Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 27, 2025

Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO₂

PM_2.5

M₁₀

O₃

Air Quality Index

January 28, 2025

Fair

Air quality is acceptable, but some individuals, particularly those unusually sensitive to air pollution, may experience minor health effects.

NO₂

PM_2.5

M₁₀

O₃

5-Day Air Quality Index Forecast in Washington D.C

Tips to Protect Yourself from Unhealthy Air Quality in Washington D.C

Limit outdoor activities, especially during peak pollution hours, often midday and afternoon. Keep windows and doors closed, and use an air purifier if possible to maintain good indoor air quality.

If you must go outside, wear a high-quality mask, such as an N95 or KN95, to filter out fine particulate matter (PM2.5) and other pollutants. This is particularly important for sensitive groups like children, the elderly, and those with respiratory conditions.

Regularly check the AQI and plan your day accordingly, avoiding strenuous activities and exercise outdoors when pollution levels are high.

FAQ

Frequently Asked Questions

When is AQI usually the worst in Washington, D.C.?

Air Quality Index (AQI) in Washington, D.C., tends to be worst during the summer months, particularly from May to September. During this period, high temperatures and intense sunlight promote the formation of ground-level ozone, a key contributor to poor air quality. Additionally, peak traffic hours in the morning and evening result in higher emissions from vehicles, further degrading air quality. Calm weather conditions, which can trap pollutants close to the ground, also contribute to elevated AQI levels.
What are common pollutants that impact AQI in Washington, D.C.?

Several pollutants contribute to air quality issues in Washington, D.C. The most common are ozone (O₃), which forms when sunlight reacts with emissions from vehicles and industrial sources, and particulate matter (PM2.5 and PM10) from traffic, construction, and natural sources like dust. Nitrogen dioxide (NO₂) from vehicle exhaust and power plants is another significant pollutant, along with carbon monoxide (CO) from incomplete fossil fuel combustion. Sulfur dioxide (SO₂), while less prevalent due to stricter environmental regulations, can still impact air quality during specific conditions.
Are there specific areas in Washington, D.C. with better AQI?

Certain areas in Washington, D.C., typically have better air quality. Parks and green spaces, such as Rock Creek Park and the National Mall, generally experience lower pollution levels due to vegetation and reduced traffic density. Residential neighborhoods located farther from major roads and industrial zones also tend to have better AQI. Northwest D.C. often enjoys cleaner air compared to downtown areas, thanks to its proximity to green spaces and lower congestion levels. Monitoring AQI by neighborhood can help identify areas with healthier air on any given day.