Sunday, 26 January 2014
Air is the mixture of gases that surround earth due to its gravitational pull. It is colourless, odourless and tasteless mixture that forms earth’s atmosphere. It contains Nitrogen (79.1%), Oxygen (20.0%), Carbon dioxide (0.03%) and traces of inert gases like argon, krypton, xenon, neon, helium, ammonia, ozone, water vapour and suspended particles (0.07%).
We need air to perform certain vital life functions. All human beings and animals breathe in Oxygen and breathe out Carbon dioxide. Plants breathe in Carbon dioxide and breathe out oxygen in the day time to manufacture their own food through Photosynthesis. But they follow the pattern of animals at the night. Without Air there would be no transmission of sound and radiation waves, no burning of fire and cycle of seasons.
When the natural composition of air is altered to such an extent, so as to make it harmful for living creatures primarily due to human activities, air is said to be ‘polluted’. Any substance that causes pollution is called pollutant. Pollutants can be solid, liquid or gaseous substance.
Air is polluted by natural ways of volcanic eruptions, forest fires, pollen from plants etc. However, nature has a way of balancing itself. Our concern here is man caused pollution which is looming largely as a threat to modern civilization. Pollution can be INDOOR as well as OUTDOOR:
INDOOR AIR POLLUTION refers to the physical, chemical, and biological characteristics of air in the indoor environment within a home, building, or an institution or commercial facility. Indoor air pollution is a concern in the developed countries, where energy efficiency improvements sometimes make houses relatively airtight, reducing ventilation and raising pollutant levels. Indoor air problems can be subtle and do not always produce easily recognized impacts on health. Tobacco smoke, cooking and heating appliances, and vapors from building materials, paints, furniture, etc. cause pollution inside buildings.
Volatile organic compounds originate mainly from solvents and the main indoor sources are perfumes, hair sprays, furniture polish, glues, air fresheners, moth repellents, wood preservatives, and many other products used in the house. Their main health effect is the imitation of the eye, nose and throat. In more severe cases there may be headaches, nausea and loss of coordination. In the long term, some of the pollutants are suspected to damage to the liver and other parts of the body.
Tobacco smoke generates a wide range of harmful chemicals and is known to cause cancer. It is well known that passive smoking causes a wide range of problems to the passive smoker (the person who is in the same room with a smoker and is not himself/herself a smoker) ranging from burning eyes, nose, and throat irritation to cancer, bronchitis, severe asthma, and a decrease in lung function.
Biological pollutants include pollen from plants, mite, hair from pets, fungi, parasites, and some bacteria. Most of them are allergens and can cause asthma, hay fever, and other allergic diseases.
Formaldehyde is a gas that comes mainly from carpets, particle boards, and insulation foam. It causes irritation to the eyes and nose and may cause allergies in some people.
Asbestos is mainly a concern because it is suspected to cause cancer.
Radon is a gas that is emitted naturally by the soil. Due to modern houses having poor ventilation, it is confined inside the house causing harm to the dwellers.
OUTDOOR AIR POLLUTION is the pollution that occurs outside homes through automobiles, industrial emissions etc.
MAIN AIR POLLUTANTS AND THEIR IMPACT ON HEALTH
1) Oxides of sulphur 2) Oxides of Nitrogen 3) Suspended Particulate Matter 4) Carbon Monoxide 5) Lead 6) Benzene 7) Hydrocarbons
Health impacts of air pollution depend on pollutant type, its concentration in air, interaction with other pollutants, and length of exposure and individual vulnerability.
Air Pollution has both acute and chronic effects on Human health. It has both long term and short term effects. It may range from minor irritation to most chronic respiratory problems.
IMMEDIATE HEALTH PROBLEMS FROM AIR POLLUTION
Ø Aggravated cardiovascular and respiratory problems
Ø Burden on heart and lungs, causing them to work harder to supply the body with oxygen
Ø Damage the cells in respiratory organs
Ø Damage to deeper portions of lungs, even after symptoms of coughing or sore throat disappear
Ø Wheezing, chest pain, dry throat, headache or nausea
Ø Increased reactivity to allergens and particles
Ø Eye irritation
Ø Reduced body immunity to infection and increased fatigue
LONG TERM EFFECTS OF AIR POLLUTION AS PERMANENT HEALTH PROBLEMS:
Ø Accelerated ageing of lungs and loss of lung capacity
Ø Decreased lung function
Ø Diseases like, asthma, bronchitis, emphysema and cancer
Ø Is a potential cause of human mortality
1. Acute respiratory infections (ARI) in children: ARI in children under 5 years in
cause: 13% of deaths; 11% of NBD; 24% of NBD for children under 5 years
(NBD- National Burden of Disease) India
ARI is the largest single disease category for
, accounting for about
one-ninth of the national burden. For the world as a whole, ARI is
also the largest category, accounting for about 8.5% of the global
Acute respiratory infections as pneumonia, is one of the chief killers of children in Developed Countries. It is well known to be enhanced by exposure to urban air pollutants and indoor environmental tobacco smoke at levels of pollution that are some 10-30 times less than that typically found in villages.
A recent study of 642 infants conducted in urban slums of
. The incidence of acute respiratory
infection was more in highly polluted areas than less polluted areas. In New Delhi , children
have to bear the double the burden of diseases that have persisted for
generations as well as of new diseases caused by various environmental factors. India
Asthma: Asthma causes: 0.2% of deaths; 0.5% of NBD in
Although Asthma rates are officially low in India , there is some recent
evidence that the true prevalence is higher than previously thought.
Associated with urban outdoor pollution and ETS (Environmental Tobacco smoke),
typical solid-fuel indoor smoke exposures are much higher.
Undoubtedly, the rates of Asthamatic patients have been increasing; it might be
due to increase in the environmental pollution.
2. Chronic obstructive pulmonary disease: Today in developed countries, nearly all cases of COPD are attributable to tobacco smoking. Undoubtedly, smoking is also a significant factor in COPD incidence among LDC (Less Developed Countries) men. In
, even though
relatively few rural women smoked during the past decades, COPD in
rural women today is not uncommon. Chronic obstructive lung disease, for which
tobacco smoking is the major risk factor remaining in the developing countries
is known to be an outcome of excessive exposure to air pollution. India
3. Cancer: There are many chemicals in biomass smoke, which are carcinogenic in nature. In recent study in Japan on the other hand, found that women aged 30 years old cooking with wood fuel have an 80% increased chance of having lung cancer in later life.
has a larger
fraction of its national burden of disease attributable to TB than any other
region, although the actual risk per person is less than that in
Sub-Saharan Africa. A large scale survey in India reported that women using bio
fuels were three times more likely to have tuberculosis than women using
cleaner fuels. India
has a larger burden of
blindness than any other major region of the world. Indeed, globally, one out
of three cataracts occurs in India where they are responsible
for 80% of blindness in the country. One case-control study in India found an excess
cataract risk of about 80% among people using biomass fuel. Delhi
The Health Information of India reports show that environmental reasons are increasingly responsible for increased mortality in women and children (see graphs: What kills India’s children). According to the report, 55 percent of child mortality in
is due to conditions originating in the prenatal period. A significant
proportion of the tables are strongly related to environmental causes. India
Sunday, 19 January 2014
Organic farming has been country’s oldest agricultural tradition. Organic farming assures not only high quality cultivation yield, but also a farming in which human health, environmental protection and productive health of the soil are as important as agricultural production. Recently with the excessive use of chemical fertilizers, insecticides and pesticides in agriculture, farm products are getting polluted and causing number of fatal diseases to human beings. Besides degrading soil properties and polluting groundwater these chemicals are disturbing the delicate balance of our eco-system.
Organic farming is slowly getting momentum in our country but it is confined to some big farmhouses or rich farmers near urban settlements. The concept is almost unheard in the rural areas in general and SC/ST and other weaker sections dominated areas in particular. Organic farming is a key factor to sustain the fertility of the soil. Use of organic fertilizer/manure is very beneficial to dry climatic conditions as water retention is almost thrice when organic fertilizers are used. The use of organic fertilizers has multiple advantages like providing essential macro and micronutrients to crops thus promoting activities of microorganisms in the soil, improving its water retention capacity and texture of aeration of root systems etc. The concept of Integrated Pest Management (IPM) for sustainable development has emerged with the increasing realization of the importance of sustainable agriculture.
We should focus on an integrated approach of organic farming, which will include field training of the major components like making compost, vermi-compost, Bio-pesticides and also value added products of organic farm produces.
Composting and vermi-composting are simple techniques of biotechnology for converting organic waste into nutrient rich manure. For several centuries, micro-organisms have been used for degrading and recycling organic waste. The organic wastes are collected in pits, covered with soil paste to provide anaerobic conditions, which helps in rapid degradation of the waste. Use of certain variety of earth-worms in composting is a good technique and with little training, people can easily use it and earn money. The microorganisms commonly encountered in the composting process are Pseudomonas, Bacillus, Arthrobacter, Nitrosomonas, Nitrobacter, Cytophage, Zoogloea and some common protozoa like Vorticella, Philodina, Trachelophyllum and Aspidisca.
Bio-pesticides are another component of organic farming. Although, there are number of agents of different origin to be used as pesticides, Botanicals (agents from plants) are easy to prepare and use. Insecticidal activity of Annona squamosa, Derris tephrosia, Acorus calamum, Melia azedarach, Walsuria trifoliate, Dysoxylum ficiforma, D. balamaricum, Azadirachta indica and Vitex negundu was established by various research laboratories. These can be extracted from various plant materials through simple techniques. Natural insecticides of plant origin are effective against a wide range of insects, many of which cannot be successfully controlled by synthetic insecticides. Natural components are relatively non-hazardous to human beings. Plant insecticides generally exert their effect by interfering with the physiology of insects, affecting their nervous system, hampering their normal development and acting as antifeedents.
SED has been promoting this concept among the farmers of Rajasthan through training and demonstration at its Gramin Vigyan Kendra (Rural Science Centre), village Digod in Kota District of Rajasthan. We are also creating awareness among general public and school children about the positive impact on not only our health but also on our environment andbio-diversity.
Saturday, 4 January 2014
In my earlier blog on ‘Importance of water and mankind’, I emphasised how precious it is and what measures should be taken to conserve it not only for ourselves but for future generations to come.
Delhi, the capital city of India is unable to provide tap water to 45% of its population. There is rampant use of ground water in drinking purposes without being tested for its worthiness. Number of report says that availability of raw water is far below the standards prescribed norm of 172 litres per person per day. Around 25% households received water through tankers with average less than 4 litres per day. The distribution of water throughout Delhi is also not equitable, with some areas receiving more.
Instead of giving thought to these pressing problems our governments are now a day resorted to freebees to get votes of poor. This was started way back in Andhra Pradesh with Rs. 2/- a kilo rice by N. T. Rama Rao, free TV in Tamil Nadu, Free electricity to farmers in Punjab, Laptops and cycles in U.P., Rajasthan and so on. Now Delhi Government with 700 litres free water to every family per day raises following questions:
· Is there enough water to meet the demand?
· Will it not make people to look for free instead of earning?
· Will it not encourage wasting of water?
· Will it not encourage people to migrate to Delhi from the areas, where they have to fetch water from 4-5 kms?
· Will it not lead to more unequal distribution?
· Will it not jeopardise future development work on laying new lines and sewage treatment?
· Will it really help the poor needy as presently metered water is supplied to rich localities?
· Will it not encourage people to have more than one connection to take the benefits?
There are many more questions can be raised but this is the first time in our politics that natural resources are being used to garner the support of people. As environmentalist I will treat it a type of corruption with Natural Resources. So we must think for future, otherwise future will not forgive us.