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What weather conditions are typically associated with areas of high and low pressure?
Tree pollen occurs first, typically from late March to mid-May. Grass (which actually has two peaks) lasts from mid-May until July, and weed pollen covers the end of June to September.
The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
Everyone looks forward to some summer sunshine but it's worth remembering that when the temperature goes up it can present health risks.
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