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Allergy Cosmos Blog
PM2.5 pollution (Particulate Matter 2.5 pollution) is a complex mixture of solid particles and liquid droplets floating in the air. It is a form of particulate pollution. The other main form of air pollution is gaseous pollution, including: ozone, nitrogen oxides and sulphur dioxide. Particulate pollution is classed according to size. So what is PM2.5? It is particles of diameters 10 micrometres (mm), or less, that are known as PM10s, and smaller particles, of diameter 2.5mm or less, are known as PM2.5s or ‘fine’ particles. The major components of PM pollution are: sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust and water.
The Chinese air purifier standard has faced frequent changes in the last 15 years. At times it has not been very specific in telling companies what they can and can’t say about their air purification systems. It wasn’t until 2008 that the government decided that change was necessary; they then updated the 2002 Chinese air purifier standard to attempt to improve the quality of air purification systems. Despite this, there has been many attempts to exaggerate on air purifier claims in China alone.
When hay fever is worse at night, hay fever symptoms like: sneezing, runny noses and sore eyes that normally come into effect during daylight, may peak during the night. After all, surely you are more exposed to pollen when you are out and about in the fresh air, rather than during the day?
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