Bronchiectasis causes abnormal widening of the airways, making it difficult to rid the lower airways of mucus and phlegm, which raises the risk of infection. 
    Pulmonary fibrosis scars and stiffens lung tissue, restricting lung movement and function. It is a type of interstitial lung disease, the umbrella term for more than 200 disorders that cause progressive and usually irreversible scarring, or fibrosis, of the lungs. "That causes the volume of the lungs to get smaller and smaller, A carcinogen is a substance, organism or agent capable of causing cancer. 
    Carcinogens may occur naturally in the environment (such as ultraviolet rays in sunlight and certain viruses) or may be generated by humans (such as automobile exhaust fumes and cigarette smoke). 
    The type and size of a dust particle influences how dust is harmful to human health. The possible amount of dust present in the air and how long you have been exposed to it are also important factors. 
    There is stronger evidence of long term health effects from PM2.5 captured particles, which includes ultrafine particles. The type of dust varies with location and possibly even with time of day. 
    Cities tend to be rich in combustion particles from vehicle emissions which is considered more harmful relative to windblown dust from the earth’s surface. 
    Dust particles small enough to be inhaled may lead to irritation of the eyes coughing sneezing hay fever asthma attacks. For people with respiratory conditions like asthma, chronic obstructive airways disease (COAD) or emphysema even small increases in dust concentration can make their symptoms worse. Currently it cannot be confirmed that dust exposure causes asthma to develop, however breathing in high concentrations of dust over many years is thought to reduce lung function in the long term and contribute to disorders like chronic bronchitis and heart and lung disorders.