Definition: Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere.
Indoor air Pollution: A lack of ventilation results in concentration of pollutants inside houses or buildings resulting in “sick buildings”. These pollutants could be chemicals that emerge from building materials such as carpets and plywood (Emit formaldehyde), Volatile organic compounds emitted by paints, varnishes and solvents. Room fresheners, dust, degenerated lead paint dust etc are some of the other indoor pollutants. Tobacco smoke, smoke from cooking practices, indiscriminate use of pesticides, rearing pets inside house etc can also result in poor indoor air quality.
Outdoor air pollution: Chemical reactions between pollutants occur from different sources like automobile exhaust and industrial emissions. Smog is a type of large-scale outdoor pollution. Smog is seen even in Thiruvananthapuram city and the major source are vehicles and industries.
Driving force: Impact of vehicular pollution is widespread and contributes to the bulk of air pollution in the city while that of the industries are localized to the areas around it. There is an increase in use of fossil fuels in transportation and industries. The number of vehicles on road has increased enormously in the last decade resulting in an increase in air pollution. Decreased availability of electricity for both small and large scale industries has resulted in increased consumption of fossil fuels for generation of energy. Thiruvananthapuram is experiencing growth in urban spread as with other districts such as Cochin and Kozhikode. Most of the growth and spread is unplanned and resulting in degradation of air quality due to uncontrolled traffic, overcrowding, and improper waste management strategies. Increased use of fossil fuels for personal transport, poor automobile and road conditions, improper collection and disposal of domestic waste / garbage before it gets rotten, open incineration of wastes without segregation, improper sewage disposal resulting in frequent spillage and overflows etc are responsible for poor quality of air in the city. Frequent daily spillage of sewage from the medical college sewage pump house polluting the entire off medical campus points finger towards mere negligence. Coir wretting activities, even though are outside the city limits confined to the Kovalam lagoon in the TS Canal region, raise concerns. The main water bodies of Thiruvananthapuram such as Karamana River, Killi River and the Parvathy Puthanar, a man made canal are highly contaminated with coliforms and sewage matter causing significant air pollution.
State: Pollution Control Board monitor Ambient air for Suspended Particulate Matter (SPM), Respirable Suspended Particulate Matter (RSPM), Sulphur Dioxide (SO2 ) and Oxides of Nitrogen (NOX ) from stations located in industrial, residential and sensitive areas. There are 4 monitoring stations located in Thiruvananthapuram City. Reports from these stations show that SPM and RSPM regularly exceed allowable limits while that of SO 2 and NO X levels are maintained within the normal limits.
Air Pollution and Lung Diseases: Pollution can lead to several health hazards and the most significant among them is the respiratory illnesses resulting in significant losses in DALYs. Prevalence of various lung diseases can be taken as an indicator for control of air pollution. Several components in the polluted air play a role in activating lung diseases like asthma, bronchitis, COPD, and pneumoconiosis (a non-neoplastic condition), especially for those who are already asthmatic. Children are more susceptible to such pollutants than the adults as they spend more time outdoors especially during midday when air pollution levels tend to be higher as their oxygen demand is higher. Diameter of the airways is smaller and hence the inflammation caused by the particulate matters within the polluted air will be higher. Older persons are the other group that is adversely affected as their respiratory reserves are already lowered resulting in exacerbation of chronic lung diseases.
Determinants: There are several determinants to the effect of air pollution on individuals. As mentioned earlier, persons with poor immunological status, those with pre-existing diseases, older persons and children are most susceptible. Poor housing, unplanned nature of the city, poor building designs and improper waste disposal mechanisms are some of the environmental determinants. Traditional cooking practices using more of kerosene or fire wood, poverty, unavailability of LPG, unemployment, urban slums are some of the socio-economic determinants. Lack of awareness about pollution is one major reason where persons are unaware of the health hazards of such pollution, safety measures and means to prevent such hazards. Public are often not empowered to get the environment clean and curb air pollution. Rather the responsibility is fully shunted to the government as if there is no responsibility for the civil society.
Recommendations
1. Strict enforcement of laws to aid fulfillment of vehicular and industrial emission standards.
2. Easy available of LPG or CNG for production of energy and electricity for industry as needed. An effort has to be made to promote use of biogas, subsidized LPG or solar source for cooking in houses. Electric induction cookers are helpful in certain conditions and are cost effective.
3. Design of buildings and industries, vehicles etc should be environment friendly.
4. Regular ambient and source air quality monitoring and surveillance to be conducted. Such mobile units may continuously monitor air quality in the city and take action immediately such as diversion of traffic in case of traffic jams, issue of notice on the spot to polluting vehicles and check the standards of automobile pollution checking centers.
5. Evaporative emissions from industries such as dry cleaners, printing, publishing, painting, and surface coatings can be recovered from being emitted to the atmosphere and this procedure has to be strictly implemented.
6. Open burning of refuse should be banned and penalized. At the same time, activities such as composting should be incentivized.
7. Create awareness about the hazards of excess use of cosmetics utilities such as air fresheners, hair sprays, deodorants, nail polish remover, shaving creams etc. and encourage them to minimize the use. Smoking tobacco in public spaces has to be banned.
8. Establish more efficient public transport system such as metro rail so that personal use of scooters and cars may be minimized. Electric vehicles and bicycles have to be promoted.
9. Proper sewage treatment has to be done and spillage of such drainage also has to be avoided. Special care has to be taken with the rivers, Parvathy Puthanar and Aakkulam lake that is causing both air pollution and water pollution.
10. An inter-departmental cooperation is essential to address this serious public health issue and such a body has to be constituted under the auspices of Pollution control board with active participation of public health professionals to track the indicators, find appropriate remedial measures and provide recommendation for policy changes.