If you are exposed to low to medium levels of air pollution , there is no general concern . for high level of pollution , there is no immediate concern but long - term effects are possible with persistent exposure . very high and severe pollution levels can mildly or significantly aggravate the symptoms to people with heart or reparatory illness 若空气污染水平属轻微至中等，表示对一般公众没有影响；若空气污染水平属偏高，表示虽然对一般公众没有即时影响，但长年持续暴露亦可对健康造成长远影响；若出现甚高或严重空气污染水平，可能会轻微或严重加剧患有心脏病或呼吸系统疾病人士的病徵。
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