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The question can be answered in two ways.

How often are you in air that contains some pollution? Answer: Almost all of the time. It is only under extreme conditions that there is not some dust, hydrocarbon,solvvent or similar material in the air we breathe.

What are the levels of pollution in the air? Answer: Air polution is usually measured in parts per million or parts per billion in the air. Maximum permitted concentrations can reach several hundred ppm for some compounds, e.g. Sulfur Dioxide.

Aside: A ppm is about a thimbleful of gas in a cubic yard of air

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Why do relative humidities seldom reach 100 percent in polluted air?

Polluted air contains particulates and pollutants that can act as condensation nuclei, which helps water droplets to form at lower relative humidity levels than in clean air. This means that in polluted air, water vapor can condense into droplets at lower relative humidities, limiting the humidity from reaching 100 percent.


Why does relative humidity rarely reach 100 percent in polluted air conditions?

Pollutants in the air can serve as condensation nuclei, promoting the formation of cloud droplets at lower humidity levels compared to clean air. This can result in clouds forming before humidity levels reach 100 percent. Additionally, pollutants like fine particles can absorb water, reducing the amount available for condensation, which can prevent humidity from reaching 100 percent.


More clouds form in a polluted air because?

pollutants provide surfaces for water vapor to condense onto, forming cloud droplets. Additionally, pollution can lead to the release of aerosols that can serve as cloud condensation nuclei, further boosting cloud formation in polluted air.


Is there a such thing as stale air?

Yes, stale air refers to air that is not circulating or being refreshed, leading to a buildup of pollutants, odors, and humidity. Stale air can make indoor environments feel stuffy and uncomfortable, and it is important to ventilate or air out spaces to prevent this.


Is an example of a respiratory illness that can be made worse by breathing in polluted air?

Asthma is a respiratory illness that can be worsened by breathing in polluted air. Pollutants in the air can trigger asthma symptoms, such as wheezing, coughing, and shortness of breath, making it more difficult for individuals with asthma to breathe.