Environmental and occupational triggers for asthma symptoms may include:

• Exposure to specific allergens (if a person is allergic to them) such as house dust mites, pollens, mould spores, pets and animals (PM10)
• Tobacco smoke and other air pollutants (PM10)
• Cold/dry air (PM10)
• Dust (PM10)
• Fumes (PM2.5)

Environmental and occupational triggers for asthma symptoms may include:

• Smoke from burning fuels of plant or animal origin (PM10)
• Outdoor air pollution (PM10 & PM2.5)
• Fumes and dust in the workplace (PM2.5)
• Childhood respiratory infections
• Chronic asthma