One of the main factors that determine indoor air quality are Pets & Pest

Are My Pets Hurting my Indoor Air Quality>

Are Cockroaches causing my allergies & asthma issues?>

Indoors, pests, house dust mites, cockroaches, and – in inner cities in particular – mice are important sources of allergens. These allergens can lead to diseases of the airways, rhinitis, and asthma. Exposure varies depending on the type of environment and cultural habits. How much contact with pets affects the development of asthma in people remains unclear. However, allergic people should avoid exposure to substances to which they are allergic
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(GreenFacts- Facts on Health and the Environment)