Low-pressure systems are associated with windy, wet conditions, which can help disperse pollutants and improve air quality

 Low-pressure systems are associated with windy, wet conditions, which can help disperse pollutants and improve air quality. High-pressure systems, on the other hand, tend to have stagnant air, which can lead to pollutant buildup and worse air quality. 

Here's a more detailed explanation:

Low-pressure systems:

Bring wet and windy weather. 

Can wash pollutants out of the atmosphere with rain or transport them to new areas, potentially improving air quality. 

The movement of air in low-pressure systems can also help to disperse pollutants, leading to cleaner air. 

High-pressure systems:

Have calm, still air. 

Can lead to the concentration of pollutants in a specific area, potentially worsening air quality. 

The lack of wind in high-pressure systems can prevent the dispersal of pollutants, resulting in higher concentrations. 

Other weather factors influencing air quality:

Temperature: Warmer air near the ground rises, carrying pollutants upwards. Cold air near the ground can trap pollutants and make them more visible. 

Sunlight: Sunlight can react with pollutants to create smog and further worsen air quality. 

Wildfires: Hot, dry weather increases the risk of wildfires, which release significant amounts of pollutants into the air. 

Inversion layers: Strong inversion layers, which are common with low-pressure systems, can trap pollutants near the ground, contributing to heavy air pollution. 

Ambient air quality standards: National Ambient Air Quality Standards (NAAQS) are set by regulatory bodies to ensure acceptable levels of pollutants in the air. 

Air Quality Index (AQI): A real-time measure of air quality at a specific location, helping to assess the current air quality conditions.