The Met Office is forecasting very high pollen counts across much of England and Wales starting Sunday, with levels expected to continue into next week. The warning is linked to warmer conditions, including an approaching heatwave with temperatures around 35C, alongside earlier warm weather in May. Multiple outlets report that the higher temperatures are likely to increase pollen production and spread, affecting people who suffer from hay fever. The Independent and Daily Mail both describe the expected pollen surge as significant and timed to the period of the heatwave, suggesting sustained exposure rather than a short-term spike. The reports focus on the geographic scope, noting that most of England and Wales are expected to be affected. Overall, the guidance centers on the expectation of very high pollen levels over several days, driven by sustained warm weather, and the potential impact on hay fever sufferers.