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Primary air pollution is effectively the first contact between pollutants and our atmosphere. These pollutants are typically emitted from identifiable sources. The emissions come from a variety of activities, mostly related to the burning of fuel – cars, factories, and power plants are the usual suspects here.

These pollutants are dangerous because they're introduced into the air in a form that has the immediate potential to harm. Carbon monoxide (CO), a gas you can't smell or see, provides a clear example of primary air pollution. It's primarily released from vehicle exhausts and, upon being inhaled, it rapidly binds with hemoglobin in the blood, leading to a deficiency of oxygen throughout the body and can result in serious health effects such as dizziness, confusion, and at high levels, even death.

The formation of secondary air pollutants represents a complex interplay of chemicals under the open sky. Unlike the primary counterparts, these pollutants are not emitted directly. Instead, they form when primary pollutants react chemically with other elements in the atmosphere. This often requires the presence of some kind of catalyzing factor, such as sunlight.

Ground-level ozone (O3) serves as the poster child for secondary pollutants. Despite ozone being beneficial in the stratosphere by protecting us from ultraviolet radiation, at ground level it's a major health risk. It's produced when nitrogen oxides (NOx) and volatile organic compounds (VOCs) – often released from vehicular and industrial emissions – react in the presence of sunlight. This can lead to respiratory issues, worsening of asthma, and can even affect heart health.

Environmental health encompasses the aspects of human health and disease that are determined by factors in the environment. It's a broad field that includes the response of the environment to human actions, like air pollution.

At the core of environmental health is the concept of exposure. For example, air pollutants can lead to a range of health problems depending on the type of pollutant, the concentration, and the duration of exposure. Chronic exposure to air pollution has been linked to heart disease, lung cancer, and respiratory diseases like asthma. These health outcomes remind us that maintaining air quality isn't just about protecting the planet – it's about protecting ourselves as well.

Atmospheric chemistry is a branch of science where the air is the laboratory. Here, scientists study the ingredients of the atmosphere and how they interact. This realm is critical to understanding both primary and secondary air pollutants.

Through this lens, we see the full scope of how human activities impact the air we breathe. Complex reactions involving man-made chemicals and natural emissions result in a variety of atmospheric compounds. The study of atmospheric chemistry is vital in devising solutions for air pollution as it helps us understand how pollutants behave, how they transform, and how they can be effectively mitigated.