Frequently Asked Questions

The Air Quality Index (AQI) is a standardized scale from 0-500 that measures air pollution levels and translates them into health impact categories. It's calculated using the concentrations of major air pollutants including:

• PM2.5: Fine particulate matter (most health-significant)
• PM10: Coarse particulate matter
• O3: Ground-level ozone
• NO2: Nitrogen dioxide
• SO2: Sulfur dioxide
• CO: Carbon monoxide

The AQI value represents the pollutant with the highest concentration relative to health standards. Each pollutant has specific breakpoints that correspond to different health concern levels.

You can find your local AQI through several reliable sources:

• Government websites: AirNow.gov (US), EPA websites
• Weather apps: Most include AQI in daily forecasts
• Dedicated air quality apps: IQAir, AirVisual, PurpleAir
• Smart home devices: Many include air quality monitoring
• Environmental monitoring sites: Local government portals

For international locations, check your country's environmental protection agency website or use global monitoring networks like the World Air Quality Index.

Both are particulate matter, but they differ in size and health impact:

The calculator is based on peer-reviewed scientific research, specifically studies showing that 22 μg/m³ of PM2.5 exposure for 24 hours has similar health effects to smoking one cigarette.

Accuracy considerations:

• Based on established epidemiological research
• Uses official EPA AQI to PM2.5 conversion formulas
• Provides population-level health impact estimates
• Individual responses vary significantly
• Designed for educational comparison, not medical diagnosis

While scientifically grounded, the tool provides approximations. Individual health impacts depend on age, health conditions, exposure duration, genetics, and lifestyle factors.

No, absolutely not. This calculator is for educational purposes only and should never replace professional medical advice.

Important limitations:

• Does not account for individual health conditions
• Cannot predict personal health outcomes
• Doesn't consider exposure duration variations
• Cannot assess genetic predispositions
• Doesn't factor in lifestyle and environmental variables

Always consult healthcare professionals for personalized health guidance, especially if you have respiratory conditions, heart disease, or other health concerns related to air quality exposure.

AQI values can vary between sources due to several factors:

• Monitoring location: Different measurement sites
• Update frequency: Real-time vs. hourly averages
• Calculation method: Different averaging periods
• Data source: Government vs. crowdsourced monitors
• Calibration differences: Sensor accuracy variations

For most accurate readings, use official government sources like EPA's AirNow.gov. Consumer-grade sensors can provide useful trends but may be less precise than regulatory monitoring stations.

When AQI is Unhealthy (101-200):

• Limit prolonged outdoor activities
• Reduce outdoor exercise intensity
• Keep windows closed
• Use air purifiers if available
• Wear N95 masks when going outside

When AQI is Very Unhealthy or Hazardous (201+):

• Avoid all outdoor activities
• Stay indoors with windows and doors closed
• Use air purifiers and HEPA filters
• Wear N95/P100 masks if you must go outside
• Consult your doctor if you have symptoms
• Consider relocating temporarily if possible

Vulnerable groups (children, elderly, pregnant women, people with respiratory/heart conditions) should take precautions even at moderate AQI levels (51-100).

Yes, properly fitted masks can significantly reduce particle inhalation:

Note: Surgical masks and cloth masks provide minimal protection against fine particles. For air pollution, use masks specifically rated for particle filtration.

Yes, quality air purifiers can significantly improve indoor air quality:

Most effective types:

• HEPA filters: Remove 99.97% of particles ≥0.3μm
• Activated carbon: Removes gases and odors
• Combination units: HEPA + carbon for comprehensive cleaning

Sizing guidelines:

• Choose units rated for your room size
• Look for high CADR (Clean Air Delivery Rate)
• Run continuously during high pollution periods
• Replace filters according to manufacturer guidelines

Air purifiers are most effective in sealed rooms. Keep windows and doors closed during high pollution periods for maximum benefit.

High AQI levels result from various pollution sources and conditions:

Weather factors that worsen pollution:

• Temperature inversions (trap pollutants)
• Low wind speeds (prevent dispersal)
• High pressure systems (stable air)
• Dry conditions (increase dust)

Health effects vary depending on exposure duration and individual factors: