If the air quality is particularly poor, and you want to exercise you should exercise in indoor facilities.
Consider the Air quality index as a scale that ranges from 0 to 500. The greater the air pollution level and the larger the health issue, the higher the AQI number. An AQI number of 50 or below, for instance, denotes good air quality, whereas one of over 300 denotes hazardous air quality.
An AQI value of 100 for each pollutant typically equates to an ambient air concentration at or below the short-term national ambient air quality threshold for protecting public health. In general, AQI scores at or below 100 are regarded as good. When AQI levels are above 100, the air is unhealthy, initially for some vulnerable groups of individuals and later, as AQI values rise, for everyone.
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