As a result of the ongoing wildfires in Canada, a large amount of smoke has drifted into the northeast United States in recent days, causing the sky over New York City to be hazy and the air quality to deteriorate. Meteorologists predict that a cold front will arrive in New York this Saturday, accompanied by thunderstorms and heavy rainfall, which may lead to the phenomenon known as “dirty rain,” where raindrops carry ash, dust, and other suspended particles.
According to the weather forecasting website AccuWeather, the wildfire smoke contains ash, soot, dust, metals, and other particles. When the rain passes through the smoky layer, these pollutants will fall to the ground with the raindrops, potentially leaving a layer of dark grey stains on outdoor surfaces such as cars, windows, patios, and streets, creating what is known as “dirty rain.”
However, experts point out that “dirty rain” also has a positive aspect. Rainfall can wash pollutants suspended in the air to the ground, helping to improve air quality. With the rain ending and cold air moving south, it is expected that the sky over New York City will clear up on Sunday, with lower humidity, improved visibility, and noticeably better air quality.
Apart from the rain itself, meteorologists are more concerned about the severe weather accompanying the cold front. The forecast indicates that Saturday afternoon to evening may see thunderstorms, heavy rain, and gusts of up to about 65 miles per hour, with localized rainfall intensities reaching up to 2 inches per hour. Due to limited drainage capacity in some low-lying areas of New York City, short periods of heavy rain may cause road flooding and localized flash floods, so people should pay attention to weather alerts and avoid going out during heavy rain.
The smoke mainly originates from the large-scale wildfires burning in Ontario, Canada. Influenced by high-altitude air currents, the smoke has traveled southward, covering the Great Lakes region and the northeastern United States, with multiple states issuing air quality alerts.
The New York City government and health department have also reminded that children, the elderly, pregnant women, and those with asthma or respiratory diseases should try to minimize outdoor activities and, if necessary, wear high-quality masks to reduce the health impacts of fine particulate matter (PM2.5).
Experts also advise that if vehicles are parked outdoors, it is best to wash them promptly after the rain to prevent ash and other contaminants from adhering to the car paint surface for extended periods. When collecting rainwater to water plants outdoors, people should also avoid direct use of this rainfall.
Overall, while the name “dirty rain” may sound concerning, it is simply a natural process of rain bringing pollutants from the air back to the ground. The real focus should still be on the impact of wildfire smoke on human health and the potential for strong winds and heavy rain on Saturday.