combustion of fuel led to the production of oxides of lead , nitrogen and sulphur

particulates release will cause haze and smog resulting in the poor vision in the area

oxides of lead , nitrogen and sulphur dissolves in water vapor and altering its pH and causing it more acidic

emission of excess heat to atmosphere  causing warming of the atmosphere

production of thick black smoke emitted without a proper filtering system lead to an increase of carbon dioxide emission

emission of CFCs (chlorofluorocarbon) in atmosphere will through a free radical reaction altering the structure of the ozone molecule (O₃) by breaking the bond to produce free radicals. CFCs can be found in refrigerant products like refrigerator, aerosol spray

emits about 1180 tons of organics; 54 tons of NO_x (oxides of nitrogen); 730 pounds of SO₂; and 7 tons of carbon monoxide (CO) 

increase production of vehicles has led to the increase of usage organic products, and heavy metals

emission of corrosive byproducts like sulphuric acid (H₂SO₄) by Contact process and hydrochloric acid (HCl) , which increase the acidity of water vapor in the atmosphere

over production of ammonia (NH₃) for fertilizer production, which are not contained in a proper manner may increase alkalinity of atmosphere

crumbling rubble and debris which floats and settles in the atmosphere, causing haze and smog (i.e. benzene, asbestos, beryllium, inorganic arsenic)

accumulation of waste leads to production of strong odor and humidity, right conditions for pests (houseflies) and bacteria growths which further aggravates the odor in the area

radioactive and hazardous waste not disposed in enclose area will cause the release of radioactive vapors or substances into atmosphere

vaporization of complex organic solvents which are non biodegradable (i.e. nonmethane organic compounds: ethane, ethylene, aldehydes, ketones)

production of strong unpleasant odor (i.e. lubricants, paints)

organic vapors reacting with chemical compounds in atmosphere which acts as insulator earth, thereby producing greenhouse effects (i.e. methane, carbon dioxide)

toxic and poisonous gases of SO_{2 ,} NO₂  and PbS₂ spewed out  

heat produce during eruptions will increase the temperature of atmosphere, altering the rate of chemical reactions occurring   

fractional distillation of crude oil to produce kerosene, gasoline and refinery gas by the cracking process (pyrolisis) involves the use of high heat energy at 450°C splitting larger alkane molecules into smaller alkane and alkene molecules which are more easily vaporized and are therefore more useful fuels 

fuel extraction, processing, refining and distribution add an additional 14% of carbon dioxide emissions (CO₂)

30% of hydrocarbon emissions are released through evaporation, which occurs from both fuel tanks and gasoline tanks

manufacture of construction equipment comparable to the degree of pollution of auto manufacturing

asphalt fumes which are bothersome and toxic, which involves the release of both particulate benzene (C₆H₆) – soluble organics and individual aromatic hydrocarbons

process of making semiconductors involves the usage of hazardous heavy metal (i.e. arsenic and lead ) 

emission of toxic byproducts into river and atmosphere (i.e. sulphates, nitrates and sulphides)

extractions of pure metal involves the heating of coke (carbon ); (i.e. iron and silicon) produce carbon dioxide and carbon monoxide

extractions of Group 1 and 2 metals (sodium, potassium, magnesium, calcium) through electrolysis involves the usage of graphite (carbon) and mercury as the electrode

improper sanitation results in the accumulation of faeces and urine  causing strong odor and smell contamination in the area