Mumbai's air quality in 'unhealthy category'; AQI at 158

This picture has been used for representational purpose

Mumbai's air quality on Saturday morning dipped with AQI 156 but remained under "unhealthy" category, according to aqi.in.

The report also stated that PM 2.5 and PM 10 concentration in Mumbai are 65 and 122 respectively.

PM2.5 concentration in Mumbai air is currently 14.5 times above the WHO annual air quality guideline value

It is still advisable to avoid outdoor exercises. Try to stay indoors with purifiers on as far as practicable and do not forget to wear N95 masks if stepping out.

Fine particulate matter (PM2.5) is an air pollutant that is a concern for people's health when levels in air are high. PM2.5 is tiny particles in the air that reduce visibility and cause the air to appear hazy when levels are elevated. Outdoor PM2.5 levels are most likely to be elevated on days with little or no wind or air mixing.

Air Quality Index (AQI) is a yardstick to measure the quality of air in a given area. It is measured from 0 to 500. A higher value of AQI denotes a greater level of pollutants in the air and hence a more severe impact on health.

The AQI index is divided into six categories, each corresponding to a different level of health concern.

- Green (0-50) - Good

- Yellow (51-100) - Moderate

- Orange (101-150) - Unhealthy for sensitive groups, Poor
- Red (151-200) - Unhealthy

- Purple (201-300) - Very unhealthy

- Maroon (301 and higher) - Hazardous