I am trying to understand primary air pollutants and why they are harmful 
There is so much information online but it is confusing
I keep reading about carbon monoxide sulfur dioxide nitrogen oxides and particulate matter
I do not know which ones are most dangerous in daily life
I also wonder how these pollutants affect indoor versus outdoor air
Some sources say that even low levels can be harmful over time
I want to know practical ways to reduce exposure at home
I also worry about sensitive groups like children and the elderly
I tried looking at government guidelines but they are full of numbers and technical terms
I am hoping for a simple explanation that makes sense for daily life
Does anyone have personal experience dealing with high levels
Are there easy precautions to take to protect family health
Any advice would be really helpful 
I learned about primary air pollutants in school but understanding their real life impact is different. Carbon monoxide comes from vehicles and can be very dangerous indoors. Even small exposure over time can cause headaches or fatigue. I use CO detectors at home and never run cars in enclosed spaces. It feels simple but it protects my family. Monitoring sources and staying aware of local pollution alerts helps too.
Sulfur dioxide and nitrogen oxides are mostly from industrial areas and heavy traffic. I live near a busy road and noticed my throat and eyes get irritated on high pollution days. I avoid going outside during peak traffic hours and use an indoor purifier. Wearing a proper mask when commuting also reduces exposure. Over time I realized these small steps help a lot.
Particulate matter is tricky because it is invisible but affects breathing immediately. I track PM2 5 in my city and notice that even a short walk during high levels can trigger coughing. I keep windows closed during bad days and use HEPA filters indoors. The pollutants are more harmful for kids and elderly so extra care is important.
I will start using a HEPA filter indoors