How This Tool Decides
Air Quality Check
We use the AQI scale (1-5). Levels 4-5 are considered unhealthy for everyone.
Humidity Check
Humidity above 70% can lead to mold growth and discomfort indoors.
Decision Logic
Open windows only when AQI ≤ 3 AND humidity ≤ 70%. Otherwise, keep them closed.
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Why Indoor Air Quality Matters
Opening windows can improve indoor air quality by reducing pollutants and bringing in fresh air. However, this depends on outdoor conditions.
Air quality (AQI) measures pollution levels. When AQI is high (4-5), outdoor air contains harmful particles that can affect respiratory health.
Humidity affects indoor comfort and health. High humidity (above 70%) promotes mold growth and dust mites, while very low humidity can cause dryness.
This tool combines real-time AQI and humidity data to give you a science-based recommendation for whether opening windows will improve or worsen your indoor air quality today.
Frequently Asked Questions
Is it safe to open windows today?
Our tool checks real-time air quality and humidity. We recommend opening windows only when AQI is 3 or below AND humidity is 70% or lower.
What humidity level is too high for opening windows?
When outdoor humidity exceeds 70%, opening windows can bring excess moisture indoors, potentially causing mold growth and discomfort.
What AQI is considered unhealthy in the UK and USA?
Both UK and US health agencies consider AQI 4 (Poor) and AQI 5 (Very Poor) as unhealthy for the general population. Sensitive groups may experience issues at AQI 3.
Why does air quality change daily?
Air quality varies due to weather patterns, pollution sources (traffic, industry), wind direction, and seasonal factors like pollen or wildfires.