Air Quality Index in St. Louis, MO

St. Louis, MO

St. Louis is a vibrant city located along the Mississippi River and is known for its iconic Gateway Arch, rich history, and diverse cultural scene. The city's air quality index varies throughout the year, influenced by factors like industrial emissions, vehicle traffic, and seasonal weather patterns. While St. Louis has made strides in improving air quality, occasional high AQI levels can occur, particularly in warmer months, due to ozone and particulate matter. Residents and visitors are encouraged to monitor the AQI, especially on days with heat or stagnant air, to take precautions as needed.

Air Quality Index

January 23, 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 24, 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 25, 2025

Good

Air quality is ideal, with minimal or no risk to health.

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

Good

Air quality is ideal, with minimal or no risk to health.

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 St. Louis, MO

Tips to Protect Yourself from Unhealthy Air Quality in St. Louis, MO

Limit outdoor activities, especially during the afternoon when ozone levels are typically highest. If you need to exercise, opt for indoor activities or go outside during early morning hours when air quality is generally better.

Invest in a good-quality air purifier to reduce indoor air pollutants. Ensure windows and doors are properly sealed to prevent outdoor air from entering. Avoid using wood-burning stoves or candles that can add to indoor pollution.

Stay updated on St. Louis' air quality index. On days with high pollution, wear an N95 mask if you must go outside to filter harmful particles and protect your respiratory system.

FAQ

Frequently Asked Questions

What factors affect the air quality in St. Louis?

St. Louis' air quality is influenced by vehicle emissions, industrial output from nearby factories, and seasonal weather patterns like temperature inversions that trap pollutants. Natural factors, such as wildfires from distant regions, can occasionally impact air quality as well.
When is AQI usually the worst in St. Louis?

The AQI in St. Louis tends to be the worst during the summer months, particularly on hot, sunny days with little wind. These conditions contribute to the formation of ground-level ozone, a major pollutant during this time.
Are there specific areas in St. Louis with better AQI?

Generally, suburban and rural areas surrounding St. Louis tend to have better air quality compared to urban centers due to lower population density, reduced traffic, and fewer industrial sources. However, local factors like proximity to highways or factories can still affect specific neighborhoods.