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Pregunta: Me gusta mucho la clima buena del verano, pero no me gusta la contaminación del aire. ¿Por qué es la contaminación del aire peor en el verano? – T.S., New York, NY

Respuesta: Hay muchos factores que trabajan juntos para producir más contaminación del aire en el verano que en las otras estaciones. En el verano, las temperaturas son más altas y hay más luz solar. Estas cosas aceleran algunas reacciones químicas en la atmósfera que conducen al smog. Alta humedad mejora la química de partícula de aerosol. Las plantas también emiten más compuestos orgánicos volátiles  (VOCs) naturales que se combinan con los contaminantes para que crear las partículas atmosféricas. Además, el aire tiende a ser más estancada cuando el clima está caliente.

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This long winter has had the AIRE team thinking about the amount of time we spend indoors, and the air quality there.

– These days, most people spend the vast majority of their time indoors (especially in the winter!). There is therefore high potential for exposure to pollutants indoors, i.e., at home or in the workplace.

– While what we think of as commonplace outdoor pollutants (e.g. car exhaust) may be less prevalent indoors than outdoors, other chemicals such as volatile organic compounds (VOCs) can be present at much higher concentrations indoors. Indoor VOCs may come from many sources including cleaning products, air fresheners, and new furniture. They can harmful to health on their own, or serve as precursors for the formation of aerosol particles.

– You have probably heard about secondhand smoke, which is the exposure of non-smokers by being around smokers. Thirdhand smoke can also be a problem. This occurs when nicotine, tar, and other harmful chemicals in tobacco smoke deposit on indoor surfaces like walls and carpets. People can be directly exposed to these chemicals through contact the surface, or reactions with gases like ozone may cause them to re-enter the gas phase.

We are looking forward to the warmer weather and more time in the fresh air outdoors!

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Question: How far do pollutants from one place travel? Can we detect pollutants from far away places in our air here? – S.S., Seattle, WA

Answer: Some atmospheric gases and particles can travel over long distances, making air quality an international issue. Dust from dust storms in Africa and China regularly reaches the Western Hemisphere, and there is evidence that the long-range transport of pollution from Asia is raising the background levels of pollutants on the West Coast of the US. buy doxycycline online australia was a recent major collaborative NASA science campaign to study the intercontinental
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Question: What are the health effects of pollution on humans? – L.I., Miami, FL

Answer: Poor air quality primarily affects the cardiovascular and respiratory systems. According to the EPA, exposure to particulate matter and ozone is associated with aggravated asthma, chronic bronchitis, reduced lung function, irregular heartbeat, heart attack, and premature death in people with heart or lung disease. For more information, see buy doxycycline hyclate 100mg capsules, maintained by Health Canada 

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Pregunta: Mi hija tiene asma. ¿De qué manera la contaminación del aire afecta a su salud? – M.N., New York, NY

Respuesta: Las personas asmáticas son muy sensibles a los efectos de la contaminación del aire. Al respirar el aire contaminado, esto puede desencadenar o empeorar los síntomas del asma.  El ĺndice de Calidad del Aire (AQI) es una medida que nos dice que tan ‘saludable’ es el estado actual del aire que respiramos. El AQI se calcula por los niveles de unas sustancias presentes en el aire, las cuales pueden afectar la salud humana, por ejemplo el ozono y la materia particulada. Un nivel AQI sobre 101 no es saludable para la gente asmática, mientras que para los adultos con un buen estado de salud y sin asma, un nivel de AQI sobre 151 no es saludable.

La Prof. McNeill también tiene asma y en los días con alto AQI, ella no se siente bien y usa más el inhalador. Cuando ella estudiaba en la universidad Caltech, cerca de Los Angeles, la calidad del aire fue muy mala, peor que hoy, y esto la motivó a estudiar la química atmosférica.

 

 

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Question: What does the air quality index measure, and what values correspond to ‘good’ air quality? – T.L., Manila, Philippines

Answer: Good question! The Air Quality Index (AQI) is calculated based on the concentrations of different pollutants in the air, including atmospheric particulate matter, ozone, carbon monoxide, sulfur dioxide, and nitrogen dioxide.  According to the U.S. EPA, an AQI of 0-50 corresponds to “good” air quality. AQI of 51-100 is “moderate.” When AQI is 101-150, the conditions are “unhealthy for sensitive groups” such as asthmatics, children, and the elderly. AQI of above 151 is considered unhealthy for everyone.

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