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Sampling techniques are methods used to select individuals from a population to participate in a study. These techniques can be broadly categorized into probability sampling, where every individual has a known chance of being selected, and non-probability sampling, where selection is based on subjective judgment. Understanding these techniques is crucial for evaluating the representativeness and validity of study findings.

Convenience sampling is a non-probability sampling technique where participants are selected based on their easy availability and proximity to the researcher. In the given scenario, the journalist is asking people at a campground, which suggests that the sample is drawn from those who are readily accessible, potentially leading to bias and limiting the generalizability of the results.

Bias in sampling occurs when certain members of a population are systematically more likely to be selected than others, leading to results that do not accurately reflect the population. In the context of the journalist's study, the choice of a campground as the location may introduce bias, as it may not represent the views of the broader population regarding air pollution, particularly those who do not camp.