diff --git a/R/nitrate.R b/R/nitrate.R
index 7284a96..efc67ec 100644
--- a/R/nitrate.R
+++ b/R/nitrate.R
@@ -8,10 +8,10 @@
 #' \item{quarter}{Quarter of the year, where Q1: Jan, Feb, Mar; Q2: Apr, May, June; Q3: July, Aug, Sept; and Q4: Oct, Nov, Dec}
 #' \item{pop_on_sampled_PWS}{Total population served by all sampled public water systems}
 #' \item{pop_0-3ug/L}{Population served by public water system with 0 - 3 ug/L nitrates}
-#' \item{pop_>3-5µg/L}{Population served by public water system with 3 - 5 ug/L nitrates}
-#' \item{pop_>5-10µg/L}{Population served by public water system with 5 - 10 ug/L nitrates}
-#' \item{pop_>10-20µg/L}{Population served by public water system with 10 - 20 ug/L nitrates}
-#' \item{pop_>20µg/L}{Population served by public water system more than 20 ug/L nitrates}
+#' \item{pop_>3-5ug/L}{Population served by public water system with 3 - 5 ug/L nitrates}
+#' \item{pop_>5-10ug/L}{Population served by public water system with 5 - 10 ug/L nitrates}
+#' \item{pop_>10-20ug/L}{Population served by public water system with 10 - 20 ug/L nitrates}
+#' \item{pop_>20ug/L}{Population served by public water system more than 20 ug/L nitrates}
 #' \item{pop_on_PWS_with_non-detect}{Population served by public water system with no detectable nitrates}
 #' \item{pop_exposed_to_exceedances}{Population exposed to nitrates that exceeds recommended limit}
 #' \item{perc_pop_exposed_to_exceedances}{Percentage of the total population exposed to nitrates that exceeds recommended limits}
diff --git a/man/nitrate.Rd b/man/nitrate.Rd
index c8f6a95..fbfcdaf 100644
--- a/man/nitrate.Rd
+++ b/man/nitrate.Rd
@@ -11,10 +11,10 @@ A data frame with 88 rows and 11 columns.
 \item{quarter}{Quarter of the year, where Q1: Jan, Feb, Mar; Q2: Apr, May, June; Q3: July, Aug, Sept; and Q4: Oct, Nov, Dec}
 \item{pop_on_sampled_PWS}{Total population served by all sampled public water systems}
 \item{pop_0-3ug/L}{Population served by public water system with 0 - 3 ug/L nitrates}
-\item{pop_>3-5µg/L}{Population served by public water system with 3 - 5 ug/L nitrates}
-\item{pop_>5-10µg/L}{Population served by public water system with 5 - 10 ug/L nitrates}
-\item{pop_>10-20µg/L}{Population served by public water system with 10 - 20 ug/L nitrates}
-\item{pop_>20µg/L}{Population served by public water system more than 20 ug/L nitrates}
+\item{pop_>3-5ug/L}{Population served by public water system with 3 - 5 ug/L nitrates}
+\item{pop_>5-10ug/L}{Population served by public water system with 5 - 10 ug/L nitrates}
+\item{pop_>10-20ug/L}{Population served by public water system with 10 - 20 ug/L nitrates}
+\item{pop_>20ug/L}{Population served by public water system more than 20 ug/L nitrates}
 \item{pop_on_PWS_with_non-detect}{Population served by public water system with no detectable nitrates}
 \item{pop_exposed_to_exceedances}{Population exposed to nitrates that exceeds recommended limit}
 \item{perc_pop_exposed_to_exceedances}{Percentage of the total population exposed to nitrates that exceeds recommended limits}