Formerly an agricultural- and fisheries-based province, Samut Sakhon in 2020 has more than 6,000 factories, most of them small, employing fewer than 50 workers, and too small to warrant much attention from Thailand's Pollution Control Department (PCD). Small firms lack the budgets to install the environmental gear that would help protect the environment. As a result, Samut Sakhon is one of the most polluted provinces in the nation. Soil and water samples from the industrial area of Mueang District were found to be contaminated with high levels of arsenic, lead, cadmium, chromium, zinc, copper, and nickel. High levels of
persistent organic pollutants (POPS), byproducts of industrial processes, were present in eggs from free-range chickens. An egg tested by researchers was found to have 84
nanograms per kilogram of
dioxins and
furans, a level 33 times higher than the safety limit observed by the European Union. The most polluted air in Thailand in 2018 was found to be in Samut Sakhon province. According to the PCD, the level of
PM2.5 in the provincial atmosphere in 2019 was unusually high, measuring as high as 195
micrograms per cubic metre (μg/m3). During the air pollution "season" of 2018–2019, PM2.5 levels exceeded the PCD's safe threshold of 50 μg/m3 for 41 days. Samut Sakhon is a leading sea salt producer. According to a survey in 2011, 12,572
rai of salt pans were managed by 242 families in Samut Sakhon. The number of factories in 2022 was 6,458 with a workforce of 372,282 people. == Health ==