Air Conditioning: too cool to be good for you?

Not so many years ago, air conditioning was a luxury vouchsafed only to the privileged few; now, though, it's the norm in many offices and public transport systems, so it's a part of our lives whether we want it or not. Unfortunately, abusively low temperatures and faulty maintenance have led to health problems, triggering common disorders in some people and occasional major outbreaks of illnesses such as Legionnaires' disease. Let's take a look at the pros and cons of keeping your cool:
Benefits:

• Extreme heat has a clear negative impact on the intellect and on physical activity and the use of air conditioning can go some way to rectifying this.
• It improves comfort levels at work and at leisure.
• It improves job performance.
• It can result in increased physical and intellectual activity.
• A lower temperature reduces the presence of insects and parasites.
• Lower temperatures mean less sweating, reducing the risk of dehydration.
• A clean air conditioning system helps exclude external allergens such as pollens.
• If the air conditioning installation is good, and if it is well maintained, it renews and improves air quality.

Risks:

• Sudden changes in temperature and humidity affect the respiratory system.
• It has a drying effect on skin and mucous membranes.
• It adds to ambient noise, contributing to noise pollution.
• The air circulation can transmit infectious respiratory diseases.
• Airborne dust and fungi can cause allergic reactions.
• Air conditioning is associated with chronic rhinitis and pharyngitis, throat irritation and hoarseness.
• Air conditioning can exacerbate eye conditions such as conjunctivitis and blepharitis, as well as causing problems for contact lens wearers.

vouchsafed: concedido
to trigger: desencadenar
outbreak: brote (de una enfermedad)
leisure: ocio
job performance: rendimiento en el trabajo
airborne: transportado por el aire
hoarseness: afonía
Read the whole article at http://www.hellomagazine.com/healthandbeauty/health-and-fitness/201007053811/air-conditioning/health/risks/