“… Name of the pollutant | Source | Effects | Refs. |
Large virus-laden aerosol (>5 µm) | Coughing / sneezing | They remain a shorter time in the air and mostly deposited on gravitational settling | [51] |
Small virus-laden aerosol (<5 µm) | Respiration / speech | They remain in the air for a longer time and eventually dispersed by winds | [51] |
They are quickly dispersed and re-circulated in restricted places with poor ventilation (hospitals, quarantine zones, dining area, kitchen area, washroom) | [8] |
VOCs (xylene, toluene) | Oil industry, Fuel-based vehicles | Causes long-term health effects like asthma, nasal tumors, tracheal, bronchial and lung cancer, leukemia | [72] , [73] , [239] |
Particulate matters (PM 2.5 & PM 10 ) | Industries, stubble burning, transportation, power plants, construction sites, coke oven battery, fly ash and cement dust | Causes carcinogenic effect to human lungs and respiratory system by penetrating the alveolar epithelium | [111] , [145] , [240] |
CO | Automobile and transport exhaust | Toxicity leads to the reduction of hemoglobin in human blood | [111] , [145] |
CO 2 | Household and greenhouse gaseous emission | Related to particulate emission (PM 10 , PM 2.5 ) and causes respiratory system imbalance | [11] , [42] , [80] , [241] |
SO X , H 2 S | Acid production plant, primary industrial hazard |
NO X , NH 3 | Burning of agricultural wastes, incineration of municipal solid waste, research laboratory usage, gaseous emission from anaerobic digestor, septic tank, toilet complex | Causes respiratory tract infection and red blood cell deformability |
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