Hello,And thanks for using JustAnswer. I am sorry no one was available to help you earlier today.There are several things you can do to help tolerate living in a dusty environment.If the dust is coming from outside of the house, then of course keeping doors and window secure will be important (Conversely, depending on the situation, opening windows at times to provide ventilation can be helpful from time to time). If the living area needs to be closed off to environmental dust coming from the outside, then an air purification system, such as a High Efficiency Particulate Air (or HEPA) filter can be effective. A good resource to learn about the different types of air filtration systems, can be found HERE. For CO2, using plants in the home is one natural way to reduce CO2. Of course this depends on the severity of CO2 in your environment. The link provided above also discusses the use of Activated Charcoal filtration devices for removal of chemicals in the air, including CO2.In a dusty, pollen, or pet dander filled environment it can also help to launder bed linens frequently (especially pillow cases).Self measures that are simple but amazingly effective are the use of a saline nasal irrigation (neti pot, or other forms) for the sinuses, and saline irrigation for the eyes daily. Most drug and some grocery stores carry 'Saline Eye Wash' (not the type used for storing contacts). These two measures rinse away the dust and chemicals from the sinuses and eyes, thus the body does not have too form excess secretions, tears, nor require frequent sneezing and coughing to remove these particles. For information on the neti pot click HERE.Natural antihistamines include Vitamin C (consuming via food is always the best) and flavanoids such as quercetin (also found in foods - highly colored vegetables, for example). Additionally, Omega 3 Fatty Acids are known to reduce allergic reactions (over time).These steps should help decrease your symptoms. Let me know though, if you have additional questions about this topic. I'll be standing by to assist you.When you are satisfied with your answer, please do rate me positively, as this is the only way I receive compensation for my time. But again, if you have further questions about this topic, please reply first so that I can assist you until you feel you have received excellent service.Thank you!