I recently came across the term criteria air pollutants and I am trying to understand what it means. It seems like there are certain pollutants that are monitored closely because they have serious health and environmental effects. I know they include things like ozone, PM2.5, and nitrogen dioxide, but I am not sure about the full list. I want to understand why these specific pollutants are called ‘criteria’ and how they affect human health. Are some more dangerous than others? I also wonder how these pollutants are measured and if there are safe levels to be aware of. Can individuals take steps to reduce exposure at home or in daily life? I would appreciate explanations from people with experience or knowledge. How can we track these pollutants effectively? Are there any practical tips to minimize risk? 
From what I learned, criteria air pollutants usually include ozone, PM10, PM2.5, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. They are called criteria because regulations set specific limits to protect human health. Monitoring them is essential for cities to control pollution levels.
I have been checking local AQI reports that reflect these pollutants. Ozone and PM2.5 are particularly concerning for me because they trigger coughing and shortness of breath. It is important to know which pollutants are high on any given day and adjust outdoor activities accordingly.
Thank you I will start paying more attention to AQI reports!
Vehicle emissions contribute to several criteria pollutants, especially nitrogen dioxide and PM2.5. I try to avoid heavy traffic routes during commuting and it helps reduce exposure. Using an air purifier at home also makes a noticeable difference.
Industries also release sulfur dioxide and other harmful compounds. Living near industrial areas, I make sure to close windows on high pollution days. Even short exposure to these pollutants can be irritating for sensitive people.